📄 Legal text
[ CAP. 454.
METROLOGY
1
CHAPTER 454
METROLOGY ACT
To repeal and replace the Weights and Measures Ordinance.
15th September, 2006
ACT XXV of 2002, as amended by Act XV of 2006; Legal Notices
427 of 2007, 110 of 2010 and 190 of 2020 ; and Act VI of 2011 and
XXI of 2020.
PART I
Preliminary
1.
The short title of this Act is the Metrology Act.
Short title.
Amended by:
XV. 2006.19.
2.
In this Act unless the context otherwise requires -
Interpretation.
Amended by:
XV. 2006.20;
VI. 2011.163.
Cap. 510.
"Authority" means the Malta Competition and Consumer Affairs
Authority as established by the Malta Competition and Consumer
Affairs Authority Act;
"calibration" refers to all the operations for the purpose of
determining the values of errors of a measuring instrument;
"container" means a container in which goods are exposed,
packed, offered for sale or sold, including, in particular, a bag,
case, carton, bottle, glass, box, can, envelope, net, sack or wrapper,
whether or not such wrapper fully encloses its contents;
"conformity assessment procedures" has the meaning assigned to
it by article 8;
"Court" means the Court of Magistrates sitting as a court of
criminal judicature;
"Director General" means the person appointed as Director
General (Standards and Metrology) by article 21 of the Malta
Competition and Consumer Affairs Authority Act;
Cap. 510.
"functions" includes powers and duties;
"goods" means anything which may be the subject of trade or
manufacture;
"inspector" means a person authorised or appointed under article
5 to be an inspector for the purposes of this Act;
"Institute" means the Standards and Metrology Institute as
established by article 21 of the Malta Competition and Consumer
Affairs Authority Act;
"legal metrology" means that part of metrology which deals with
units of measurement, methods of measurement and of measuring
instruments in relation to the mandatory technical and legal
requirements which have the object of ensuring the appropriate
accuracy of measurements;
Cap. 510.
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"mark" or "marking" includes any inscription, stamp or label
signifying conformity or otherwise of a measuring instrument with
this Act and regulations made thereunder whether applied by
impressing, casting, engraving, etching, branding or otherwise;
"measurement standard" means a measuring instrument intended
to define, to represent physically, to conserve or to reproduce the
unit of measurement of a quantity, or a multiple or sub-multiple of
that unit in order to transmit it to other measuring instruments by
comparison;
"measuring" means the act or process of appraising, assessing,
calculating, calibrating, computing, estimating, evaluating or
gauging of length, volume, weight or magnitude, and
"measurement" shall be construed accordingly;
"measuring instrument" means a device intended to be used to
make measurements, alone or in conjunction with a supplementary
device or devices;
"Metrology" is the field of knowledge concerned with
measurement, the principal fields of which are: units of
measurement and their measurement standards, measurements and
measuring instruments;
"Minister" means the Minister responsible for standards and
metrology and includes, to the extent of the authority given, any
person authorised by the Minister to act in that behalf for any
purpose of this Act;
"ordinary measuring instrument" means a measuring instrument
intended for ordinary use but not for the verification of other
measuring instruments;
"periodical verification" means a verification of a measuring
instrument, not being an initial verification, which is carried out
periodically, at such intervals and according to such procedures as
may be established by the Institute;
"pre-package" means a product which has been placed in a
container of whatever nature without the purchaser being present
and where the quantity of the product contained in the package has
a pre-determined value and cannot be altered without the package
either being opened or undergoing a modification;
"prescribed" means prescribed by regulations made under this
Act;
"prescribed purpose" refers to any of the purposes falling within
the terms of article 7(1);
"sell" includes offer, expose, advertise or keep for sale, and to
supply by way of or for the purpose of consumption, and similar or
related words shall be construed accordingly;
"SI System" means the International System of Units, "SI",
namely, the coherent system of units adopted and recommended by
the 11th General Conference on Weights and Measures (Conférence
Générale des Poids et Mesures - CGPM) in 1960, and as may be
revised from time to time;
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"stamp" means a device used to apply a mark under this Act to a
measuring instrument to indicate that it conforms to the
requirements of verification;
"stamping" includes any operation adopted for the purpose of
applying to a measuring instrument the marks indicating that it
conforms to the requirements of verification;
"type approval" means the examination, including testing in
accordance with international practices, and approval of a
particular design or pattern of measuring instrument to show that it
is suitable for use for a prescribed purpose and is capable of
achieving the accuracies required;
"unit verification" means the examination of a measuring
instrument, generally of a unique design and intended for a specific
application, to establish that it satisfies legal metrological
requirements;
"user" means the person or organisation responsible for the use
of the measuring instrument for the purposes of this Act;
"verification" means all the operations carried out by the
Institute, or by verifiers on its behalf, having the object of
ascertaining and confirming that the measuring instrument entirely
satisfies the requirements of this Act in respect of verification;
"verification mark" means a mark applied to a measuring
instrument certifying that the verification of the measuring
instrument was carried out with satisfactory results;
"verifier" means a person authorised or appointed under article 5
to carry out verification within the meaning and for the purposes of
this Act.
PART II
Administration
3. (1) The Director General (Standards and Metrology), as
appointed by the Malta Competition and Consumer Affairs
Authority Act, shall have the responsibilities as may be assigned to
him by this Act, by the Malta Competition and Consumer Affairs
Authority Act, and by any other law.
Director General
(Standards and
Metrology).
Amemded by:
VI. 2011.163, 164.
Cap. 510.
(2) The Director General shall carry out such functions as are
assigned to him by this Act or by regulations made thereunder or by
any other law.
(3) The Director General shall furnish to the Authority such
information regarding the performance of his functions as the
Authority may from time to time request.
(4) The Director General and any other person as may be
employed or otherwise appointed by the Authority to exercise
functions under this Act shall not have any personal interest in the
making, adjusting or selling of measuring instruments.
4. (1) There shall be established a Metrology Advisory
Board, the functions of which shall be:
(a) to provide advice of a scientific and technical nature to
The Metrology
Advisory Board.
Amended by:
VI. 2011.163.
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CAP. 454.]
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the Director General and to provide assistance on
general matters of policy and organisation relating to
the functions and activities of the Institute; and
(b) to submit proposals and recommendations for new
projects in the field of legal metrology.
(2) The number of members, manner of procedure of their
appointment and their terms of office shall be determined by the
Authority, provided that the members shall be appointed from
among persons enjoying technical expertise in legal metrology.
(3) Administrative matters relating to the Metrology Advisory
Board shall be conducted by the Director General.
Appointment of
inspectors and
verifiers.
Amended by:
VI. 2011.163.
5. (1) The Authority may appoint any person being an officer
of the Authority to be an inspector for the purposes of this Act.
(2) The Institute may appoint any person, whether physical or
otherwise, to be a verifier for the purposes of this Act.
(3) (a) The Institute shall provide for the holding of
examinations for the purpose of ascertaining whether persons
possess sufficient skill and knowledge for the proper performance
of the functions of inspectors and verifiers, and for the granting of
certificates of qualification to persons who pass such examinations.
(b) The Institute shall establish the standard of skill and
knowledge, as well as other requirements, needed for a person to
qualify as inspector or verifier.
(4) The Institute shall ensure that the persons so appointed
continue to meet the requirements laid down in accordance with
subarticle (3).
(5) Every person appointed under subarticles (1) and (2) as an
inspector or as a verifier shall be furnished with a certificate of his
appointment by the Institute. Such certificate shall be valid for such
period and may include such conditions as the Director General
may consider appropriate.
(6) The Institute may, if it deems fit, arrange with some other
person to hold examinations for the purpose mentioned in
subarticle (3).
(7) No certificate of qualification shall be issued to any person
who has not yet attained the age of eighteen.
(8) There shall be charged, in respect of any examination which
is held by the Institute under this article, such fees as the Authority
may from time to time determine.
(9) The Authority may, upon the recommendation of the
Director General, and under such conditions as may be prescribed,
at any time revoke an appointment made under this article, and in
such case, the person whose appointment is so revoked shall
surrender to the Institute the certificate furnished under this article.
(10) The Institute shall monitor the activities of the verifiers
appointed under this Act.
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6. (1) An inspector duly appointed in terms of this Act, in the
discharge of his duties, shall have the following powers:
(a) to enter and search any industrial establishment or
commercial premises or vehicles or vessels, where a
measuring instrument which is meant to be used for
any prescribed purpose, is installed or kept, or where
there is reason to believe it is installed or kept;
(b) to enter any premises or any other place, including a
vehicle or vessel, in which any activity in connection
with the manufacturing, processing, supplying,
distributing, importing or wholesale or retail selling of
goods is carried on;
(c) to inspect such premises and examine and test any
such measuring instruments or goods found thereon
for the purposes of establishing conformity with the
provisions of this Act;
(d) to apply non-conformity marks to the measuring
instrument if, following any such inspection or testing,
a measuring instrument is found not to be in
conformity with the provisions of this Act;
(e) to remove from the premises for examination, testing
and measuring any goods or measuring instrument to
which a non-conformity mark has been applied;
(f) to require the owner, the person in charge or any
employee in charge of or at the place entered to
provide all reasonable assistance including personal
assistance, and to produce books, records and written
or electronic documents to enable the inspector to
carry out his functions under this Act;
(g) to inspect and copy or take extracts from any such
books, records or other documents; and
(h) in the case of any vehicle or vessel referred to in
paragraph (a), to request the owner or operator thereof
to bring the vehicle or vessel for examination to a
location as may be indicated to him by the inspector.
(2) An inspector who removes a measuring instrument or goods
pursuant to subarticle (1)(e) shall notify forthwith, and issue a
receipt to, the person from whose premises the measuring
instrument or goods are taken, or that person’s authorised
representative, indicating that the measuring instrument or goods,
as the case may be, are taken in pursuance of this Act.
(3) No entry and search shall be effected outside the normal
business hours of the establishment concerned, unless the Director
General has cause to believe that delay could cause the loss or
suppression of any evidence or may otherwise prejudice the
outcome of the search.
(4)
An inspector may seize and retain:
(a) any article, measuring instrument, stamp or goods
which he believes to be in contravention of this Act;
Powers of
inspectors.
Amended by:
VI. 2011.163.
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CAP. 454.]
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and
(b) any document relating to a measuring instrument or
any document displayed with any goods offered or
exposed for sale which relates to the price or quantity
of the goods, and which the inspector believes may be
required as evidence in any proceedings.
(5)
Any person who (a) obstructs or impedes an inspector in the exercise of his
functions, or does not comply with a requirement made
by an inspector in carrying out any of his functions
under this Act, or
(b) refuses or fails to give an inspector any assistance or
information which the inspector may request in the
performance of any of his functions under this Act, or
(c) makes an incorrect, false or misleading statement,
either verbally or in writing, to an inspector who is
engaged in carrying out any of his functions under this
Act,
shall be guilty of an offence under this Act.
(6) Where it results to an inspector that a measuring instrument
or a measurement standard fails to give the correct measurement
which it purports to give or is otherwise faulty, the inspector may
give the person responsible a written notice ordering him that, until
such time as the said notice is withdrawn, the measuring instrument
shall not be used and, where applicable, shall be removed. Any
person who knowingly acts in contravention of such written notice
shall be guilty of an offence under this Act.
(7) The Director General may exercise any of the powers
conferred on an inspector under this article.
(8) In the course of any entry and search under this article, the
Director General may request the assistance of the Police.
(9) In the exercise of any powers conferred by this article, the
inspector shall, if so requested, provide evidence of his
appointment.
(10) The inspector may be accompanied by such other persons
and take with him such instruments as are necessary for the purpose
of carrying out his functions.
PART III
Control Procedures of Measuring Instruments, Measurements,
Product Quantities and Pre-packages
Metrological
controls of
measuring
instruments.
Amended by:
VI. 2011.163.
7. (1) Measuring instruments used or intended to be used for
certain measurements, including:
(a) measuring instruments used for the verification of
ordinary measuring instruments;
(b) measuring instruments used for transactions in goods
and services, fiscal or postal transactions, or for
METROLOGY
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analogous or similar purposes in pursuance of a trade
or business;
(c) measuring instruments used in or for the enforcement
of this Act or of any other law; and
(d) measuring instruments used in the field of public
health, safety or environmental protection,
as may be prescribed shall be subject to metrological controls.
(2) Only measuring instruments that have successfully
undergone the controls listed under article 8(2) and such other
controls as may be established by the Institute may be used for any
prescribed purpose.
(3) Persons importing, manufacturing, repairing, selling,
hiring, using or otherwise dealing in measuring instruments within
the meaning of subarticle (1), must inform the Institute of their
activity and become registered with it within such timeframes as
the Institute may establish by notice in the Gazette, and different
timeframes may be established for different categories or classes of
measuring instruments. For this purpose, the Institute shall
maintain a register of such persons, and it shall have the power to
require any such person to furnish it with any information,
documentation and undertakings as it may deem fit.
(4) Any person who fails or neglects to comply with the
provisions of subarticles (1), (2) or (3) shall be guilty of an offence.
(5) Where, in the special circumstances of any particular case,
it appears to the Institute that it would be impracticable or
unnecessary that a particular measuring instrument be subjected to
metrological controls in terms of this article, the Institute may, by
an exemption in writing, dispense with such requirement. The
Institute may attach any conditions, including a time limit, to any
such exemption and any person who contravenes any condition
attached to an exemption shall be guilty of an offence.
(6) For the purposes of this article, "measuring instrument"
shall include any measuring instruments used or offered for use by
private or public undertakings.
8. (1) Measuring instruments intended for use for any
prescribed purpose, including public weighing, shall be subject to
such conformity assessment procedures as may be prescribed by
the Institute by notice published in the Gazette.
(2) The conformity assessment procedure may include such
controls as may be prescribed by the Institute, and may include:
(a)
(b)
(c)
(d)
(e)
(3)
type approval;
initial verification;
verification after repair or modification;
periodical verification;
supervision of the procedures effecting the use or
operation of measuring instruments.
The Institute shall certify whether or not the measuring
Conformity
assessment
procedures.
Amended by:
VI. 2011.163.
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CAP. 454.]
METROLOGY
instrument has successfully undergone the conformity assessment
procedures adopted in its regard in terms of subarticle (2):
Provided that a certificate of conformity issued by an
inspector or a verifier duly appointed in terms of article 5 shall be
valid and effective as if issued by the Institute.
Marking of
measuring
instruments.
Amended by:
VI. 2011.163.
9. (1) Measuring instruments which have been subject to the
conformity assessment and inspection procedures and which have
been found to conform to the relative requirement shall have
affixed, stamped, marked or otherwise applied on them marks
signifying their conformity to the relevant requirement or provided
with corresponding certificates and shall accordingly qualify as a
"legally controlled measuring instrument". These marks, their
form, design, application or obliteration together with facilities for
receiving such marks shall be prescribed by the Institute which, for
the purposes of this subarticle, may impose additional requirements
in any matter related to the measuring instrument itself.
(2) A measuring instrument which has not undergone these
controls successfully may be given a rejection mark and must be
modified, repaired or withdrawn. These marks, their form, design,
application or obliteration together with facilities for receiving
such marks shall be prescribed by the Institute.
(3) Only persons duly authorized by the Institute may mark or
stamp a measuring instrument with metrological control marks in
terms of subarticles (1) and (2).
(4) In the event that any marks that should be applied in terms
of this article present any difficulty, the Institute may establish
alternative forms or means of application.
(5) Stamps shall be made of such material as is determined by
the Institute.
(6) Any measuring instrument to which a rejection mark has
been affixed, stamped, marked or otherwise applied in terms of this
article shall not be used for any prescribed purpose.
(7) Any person keeping or using, for any transaction falling
within any prescribed purpose, any false or inaccurate measuring
instrument or any measuring instrument which does not bear a
verification mark or which bears a rejection mark shall be guilty of
an offence.
(8)
For the purposes of this article:
(a) "legally controlled measuring instrument" means a
measuring instrument which conforms to prescribed
requirements, in particular legal metrological
requirements; and
(b) "rejection mark" means a mark or seal applied to a
measuring instrument in a conspicuous manner to
indicate that the measuring instrument does not
comply with the statutory requirements and
obliterating any previously applied verification mark.
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10. (1) The calibration device on a measuring instrument shall
be secured in such a manner as to enable an adjustment to be
detected whether on verification or otherwise.
(2) The means by which a calibration device shall be secured
shall be provided by the manufacturer, supplier or user of the
measuring instrument.
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Sealing and
securing measuring
instruments.
Amended by:
VI. 2011.163.
(3) The Institute may, from time to time, prescribe specific
requirements on the sealing or securing of measuring instruments.
11. (1) In circumstances as may be determined by the
Institute, any measuring instrument or particular type of measuring
instrument may be adjusted by an inspector.
(2) Where, on examination by an inspector, a measuring
instrument is found to be inaccurate, and adjustment of the
measuring instrument is necessary in order to render it
metrologically accurate, the inspector shall:
Adjusting of
measuring
instruments.
Amended by:
VI. 2011.163.
(a) notify the owner of the measuring instrument or the
owner’s authorised representative accordingly,
detailing the results of the examination; and
(b) request the owner or his representative either to have
the work carried out by a third party or to empower the
inspector to undertake the necessary adjustment.
(3) The owner or his representative shall bear any costs arising
from any adjustment as is referred to in subarticles (1) and (2).
12. (1) Any measurements that may result from the use of any
prescribed purpose may be subject to metrological controls.
(2) The Minister, acting on the advice of the Authority, may
define the measurements that are subject to such controls.
Liability of certain
measurements to
metrological
controls.
Amended by:
VI. 2011.163.
(3) The Institute may establish the methods and procedures for
the undertaking of such controls as it may deem appropriate.
13. (1) Where a transaction may involve the delivery of a
definite quantity of a product or an offer for sale involving the
indication or labelling of a definite quantity of the product, these
product quantities may be subject to metrological controls.
(2) The Institute may, from time to time, establish requirements
relating to the control methods and the metrological conditions
with which quantities of products and pre-packages must comply,
and may define permissible tolerances or variations on quantities.
(3) Any person who, for the purposes of trade or business,
sells, buys or offers to buy, delivers or causes to be delivered, any
goods by weight, by quantity, by number of items or by any other
measure, which does not satisfy the requirements established under
this article or any other provision of this Act, shall be guilty of an
offence.
Metrological
control of product
quantities and prepackages delivered
or exposed for sale.
Amended by:
VI. 2011.163.
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CAP. 454.]
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PART IV
Authorised Units and Measurement Standards
Legal units of
measurement.
14. (1) The units of measurement which are authorised for the
purposes of this Act and for any other purposes of law shall be
those listed in the First Schedule. Such units shall be used for all
transactions which directly or indirectly involve a measurement.
(2) The only lawfully permissible linear, capacity and weight
standard measures that may be used for any prescribed purpose
shall be those set out in the Second Schedule.
(3) For all purposes of law, the conversion of a unit of
measurement listed in the First Schedule to another unit of
measurement not so listed shall be calculated on the basis of the
tables of equivalence laid down in the Third Schedule.
(4) The Fourth Schedule shall be used in the interpretation and
application of the provisions of the First Schedule.
Denominations of
measurement
standard.
15. (1) No person shall hold or have in his possession for any
prescribed purpose any linear, capacity or weight standard measure
which is not of a denomination shown in the Second Schedule.
(2) Any person who contravenes the provisions of subarticle
(1) shall be guilty of an offence.
Measurement
standards.
Amended by:
VI. 2011.163;
XXI of 2020.
16. (1) The Authority shall provide, maintain or cause to be
maintained such measurement standards including facilities,
equipment and reference materials as are considered necessary
from time to time to facilitate the realisation and dissemination of
the SI System of Units of measurement, and to make funding
available for such purposes.
(2) For the purpose of subarticle (1), the Authority may, upon
the recommendation of the Director General, designate and
delegate other organisations to be responsible bodies in specialised
fields of measurement.
(3) The Director General may define the measurement standards
maintained under subarticles (1) or (2) and the conditions of their
maintenance, including traceability, custody and the intervals
within which the values of measurement standards shall be
determined.
(4) Where any doubt arises as to the continued conformity of a
measurement standard with the appropriate permissible limits of
error, the measurement standard shall not be used until its value has
been redetermined or it has been replaced by a measurement
standard conforming to the appropriate permissible limits of error.
An up-to-date certificate of traceability shall be maintained in
respect of every measurement standard or set of measurement
s t a n d a r d s m a i n t a i n e d b y t h e I n s t i t u t e o r a n y o rg a n i s a t i o n
designated under subarticle (2).
(5)
For the purposes of this article:
(a) "reference material" means a material one or more of
whose properties are sufficiently homogeneous to be
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used for the calibration of an apparatus, the assessment
of a measurement method or the assignment of values
to materials; and
(b) "traceability" means the property of the result of a
measurement which is related, through an unbroken
chain of comparisons, to international measurement
standards.
PART V
General provisions
17. (1) No person shall act as a public weigher unless
authorised by the Institute.
Public weighers.
Amended by:
VI. 2011.163.
(2) No authorisation shall be granted to any person in terms of
subarticle (1) unless (a) he has attained the age of eighteen years;
(b) he has been found guilty of fraud or of an offence
affecting public trust; and
(c) he has passed a qualifying examination set by the
Institute.
(3) Any person acting as a public weigher without the
necessary authorisation from the Institute shall be guilty of an
offence.
(4) The Institute may, from time to time, issue requirements
and guidelines for persons undertaking the activity of public
weighers.
18. The officers of the Institute shall be deemed to be public
officers for all purposes of the Criminal Code.
Public officers.
Amended by:
VI. 2011.163.
Cap. 9.
19. (1) The Minister may, on the advice of the Authority,
make regulations -
Regulations.
(a) imposing requirements in relation to any matter related
to the pre-packaging of goods, measuring containers,
quantities and capacities permitted for pre-packaged
products, the make-up by weight or volume of prepackaged goods, the make-up by volume of prepackaged liquids and measuring instruments; and
(b) adopting and implementing any commitments and
obligations relating to metrology arising out of or
under any treaty, convention or other international
agreement, whether bilateral, regional or multilateral,
to which Malta is a party.
(2) The Minister may, on the advice of the Authority, amend
any of the schedules annexed to this Act; and any such amendments
may contain such transitional or other incidental provisions as may
be prescribed.
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CAP. 454.]
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Fees.
Amended by:
VI. 2011.165.
Cap. 510.
20. The Authority may, by virtue of this Act and under the
powers conferred by article 48 of the Malta Competition and
Consumer Affairs Authority Act, levy fees and other charges for
type approval, verification, inspection, certification and for any
authorisation and registration, or in respect of any other matter
arising under this Act, and different fees or charges may be levied
for different classes of cases or for different circumstances, and
provision may also be made for the imposition of additional
charges in the event of delay or failure to pay such fees.
Language of
Schedules and
regulations.
21. (1) The Schedules and regulations made under any
provision of this Act may be drawn up in the English language
only.
(2) In the event of conflict or incompatibility between the
Maltese and English texts of any Schedules and regulations made
under this Act, the English language version shall prevail.
PART VI
Offences and Penalties
Forgery and false
marking.
22.
Any person who (a) forges or counterfeits any mark of a type used on any
measuring instrument used or intended to be used for
any prescribed purpose;
(b) applies to any measuring instrument a mark which is
forged or counterfeit, or which is false or incorrect; or
(c) uses, sells, utters or disposes of any measuring
instrument with such forged, counterfeit, false or
incorrect mark thereon, or any mark liable to be
confused with marks authorised under the provisions
of this Act,
shall be guilty of an offence.
Tampering with
marks and
measuring
instruments.
23.
Any person who (a) by any means renders a measuring instrument false or
inaccurate;
(b) for any prescribed purpose, uses, supplies, sells, utters
or disposes of a false or inaccurate measuring
instrument; or
(c) not being an inspector or verifier authorised under this
Act, attaches, affixes inscribes, inserts or otherwise
applies any mark or plate intended for marking, or
removes, defaces, obliterates or otherwise changes any
such mark or plate from a measuring instrument, or
attaches, affixes, inscribes or inserts such mark or
plate into a measuring instrument other than the
measuring instrument on which the mark was lawfully
inscribed in terms of this Act,
shall be guilty of an offence.
Removing or
breaking of tags,
seals and devices.
24. Any person who unlawfully removes, defaces, obliterates,
breaks or otherwise changes any tag, seal or device that has been
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placed, affixed or attached by an inspector or by a verifier to a
measuring instrument that is or is intended to be used for any
prescribed purpose shall be guilty of an offence.
25.
Any person who (a) sells any product by weight, measure or number where
the weight, measure or number of the goods sold is
less than that purported to be sold or is less than
corresponds with the price charged;
(b) in connection with a measuring instrument, makes a
false record of any measuring; or
(c) commits any other fraud in connection with any
measuring by means of a measuring instrument,
Short measure on
sale.
shall be guilty of an offence.
26. (1) The Director General may assist and participate in the
prosecution of offences under this Act.
(2) Proceedings for an offence under this Act may be instituted
within twelve months from the commission of the offence.
27. (1) A person found guilty of an offence under articles
9(7), 22, 23, 24 and 25 shall, on conviction, be liable to a fine
(multa) of not less than one thousand and one hundred and sixtyfour euro and sixty-nine cents (1,164.69) and not exceeding eleven
thousand and six hundred and forty-six euro and eighty-seven cents
(11,646.87), or to imprisonment for a term not exceeding two years,
or to both such fine and imprisonment.
Prosecution of
offences.
Amended by:
VI. 2011.163.
Penalties.
Amended by:
L.N. 427 of 2007.
(2) A person found guilty of an offence under this Act, other
than an offence listed in subarticle (1), shall, on conviction, be
liable to a fine (multa) of not less than one hundred and sixteen
euro and forty-seven cents (116.47) and not exceeding two
thousand and three hundred and twenty-nine euro and thirty-seven
cents (2,329.37), or to imprisonment for a term not exceeding six
months, or to both such fine and imprisonment.
(3) Without prejudice to the provisions of the Criminal Code,
in any judgement given in proceedings instituted under this Act, the
Court may order the forfeiture, destruction or other method of
disposal of the goods or measuring instruments to which any of the
offences relates, as it may consider appropriate at the expense of
the person found guilty of the offence.
(4) Where it is satisfied that the circumstances so warrant, the
Court may, upon conviction for any offence committed under this
Act, additionally order the suspension or cancellation of any
license or licenses issued in favour of the person charged or in
respect of the premises involved in the proceedings.
(5) Any person convicted in relation to an offence under article
6(6) shall be liable to an additional fine (multa) of not more than
four hundred and sixty-five euro and eighty-seven cents (465.87)
for each day that the notice has not been complied with.
(6) Where a person has been convicted of an offence under this
Act, the Court shall order that person to reimburse to the Authority,
Cap. 9.
14
CAP. 454.]
METROLOGY
within such period as the Court shall stipulate, any costs incurred in
connection with the proceedings instituted against him. Such costs
shall include expenses incurred in the seizure, lifting, detention,
testing, analysis, inspection and examination of measuring
instruments and measurement standards involved in the said
proceedings.
(7) The Attorney General shall have the right to appeal from
any judgement given in proceedings instituted under this Act or in
connection with regulations made thereunder.
PART VII
Savings
Savings.
Amended by:
VI. 2011.163.
Cap. 39.
28. (1) Any references in any other law to the Weights and
Measures Ordinance* shall be construed as being references to this
Act; provided that any registrations, licences, authorisations,
orders, regulations or other action whatsoever made or issued by
virtue of the said Ordinance shall continue in force as if made or
issued under this Act in so far as applicable.
(2) Unless the context otherwise requires, any reference in any
other law, contract or other act in force at the commencement of
this Act to standard weights or measures in use in Malta shall be
deemed to be references to the respective equivalents ascertained in
terms of the First and Third Schedules to this Act.
(3) Verifications issued under the Weights and Measures
Ordinance which are valid immediately before the coming into
force of article 8 shall continue to be valid on or after that date for
such period as may be prescribed by the Institute by notice
published in the Gazette.
*Repealed by this Act.
[ CAP. 454.
METROLOGY
FIRST SCHEDULE
(Article 14)
15
Amended by:
L.N. 110 of 2010;
L.N. 190 of 2020
LEGAL UNITS OF MEASUREMENT
1.
SI UNITS AND THEIR DECIMAL MULTIPLES AND SUBMULTIPLES
1.1
SI base units
QUANTITY
Time
Length
Mass
Electric current
Thermodynamic temperature
Amount of substance
Luminous intensity
UNIT
Name
second
metre
kilogram
ampere
kelvin
mole
candela
Symbol
s
m
kg
A
K
mol
cd
Definitions of SI base units:
Unit of time
The second, symbol s, is the SI unit of time. It is defined by taking the fixed
numerical value of the caesium frequency
, the unperturbed ground-state
hyperfine transition frequency of the caesium 133 atom, to be 9 192 631 770 when
expressed in the unit
, which is equal to s–1.
Unit of length
The metre, symbol , is the SI unit of length. It is defined by taking the fixed numerical
value of the speed of light in vacuum to be 299 792 458 when expressed in the unit
,
where the second is defined in terms of
.
Unit of mass
The kilogram, symbol
, is the SI unit of mass. It is defined by taking the fixed
numerical value of the Planck constant to be 6.626 070 15 × 10–34 when expressed
in the unit J s, which is equal to kg m 2 s –1 , where the metre and the second are
defined in terms of and
.
Unit of electric current
The ampere, symbol A, is the SI unit of electric current. It is defined by taking the
fixed numerical value of the elementary charge to be 1.602 176 634 × 10–19 when
expressed in the unit C, which is equal to A s, where the second is defined in terms
of
.
Unit of thermodynamic temperature
The kelvin, symbol K, is the SI unit of thermodynamic temperature. It is defined
16
CAP. 454.]
METROLOGY
by taking the fixed numerical value of the Boltzmann constant to be 1.380 649 ×
10 –23 when expressed in the unit J K –1, which is equal to kg m 2 s –2 K –1, where the
kilogram, metre and second are defined in terms of , and
.
Unit of amount of substance
The mole, symbol mol, is the SI unit of amount of substance. One mole contains
exactly 6.022 140 76 × 1023 elementary entities. This number is the fixed numerical
value of the Avogadro constant,
, when expressed in the unit mol –1 and is called
the Avogadro number.
The amount of substance, symbol n, of a system is a measure of the number of
specified elementary entities. An elementary entity may be an atom, a molecule, an
ion, an electron, any other particle or specified group of particles.
Unit of luminous intensity
The candela, symbol cd, is the SI unit of luminous intensity in a given direction. It
is defined by taking the fixed numerical value of the luminous efficacy of
, to be 683 when
monochromatic radiation of frequency 540 × 10 12 Hz,
expressed in the unit lm W –1 , which is equal to cd sr W –1 , or cd sr kg –1 m –2 s 3 ,
where the kilogram, metre and second are defined in terms of , and
1.1.1. Special name and symbol of the SI derived unit of temperature for
expressing Celsius temperature
QUANTITY
Celsius temperature
UNIT
Name
degree Celsius
Symbol
°C
Celsius temperature t is defined as the difference t = T – T 0 between the two
thermodynamic temperatures T and T0 where T0 = 273.15 K. An interval or difference of
temperature may be expressed either in kelvins or in degrees Celsius. The unit "degree
Celsius" is equal to the unit "kelvin".
1.2
SI derived units
Definitions of supplementary SI units:
Unit of plane angle
The radian is the angle between two radii of a circle cut off on the circumference
of an arc equal in length to the radius.
Unit of solid angle
The steradian is the solid angle of a cone which, having its vertex in the centre of
a sphere, cuts off on the surface of the sphere an area equal to that of a square with
sides of length equal to the radius of the sphere.
1.2.1. (Deleted by Legal Notice 110 of 2010).
1.2.2. General rule for derived units
Units derived coherently from SI base units are given as algebraic expressions in
the form of products of powers of the SI base units with a numerical factor equal to
1.
[ CAP. 454.
METROLOGY
17
1.2.3. SI derived units with special names and symbols
Quantity
Unit
Name
Symbol
Plane angle
Solid angle steradian
Frequency
Force
Pressure, stress
Energy, work;
quantity of heat
Power (1), radiant flux
Quantity of electricity,
electric charge
Electric potential,
potential difference,
electromotive force
Electric resistance
Expression
In terms of In terms of SI base
other SI units
units
m . m-1
m2 . m-2
s-1
m . kg . s-2
-2
N.m
m-1 . kg . s-2
N.m
m2 . kg . s-2
radian
steradian
hertz
newton
pascal
joule
rad
sr
Hz
N
Pa
J
watt
coulomb
W
C
J . s-1
m2 . kg . s-3
s.A
volt
V
W . A-1
m2 . kg . s-3 . A -1
V . A-1
m2 . kg . s-3 . A -2
ohm
Conductance
siemens
S
A . V-1
m-2 . kg -1 . s3 . A 2
-1
Capacitance
farad
F
C.V
m-2 . kg -1 . s4 . A 2
Magnetic flux
weber
Wb
V.s
m2 . kg . s-2 . A -1
-2
Magnetic flux density
tesla
T
Wb . m
kg . s-2 . A -1
-1
Inductance
henry
H
Wb . A
m2 . kg . s-2. A -2
Luminous flux
lumen
lm
cd . sr
cd
Illuminance
lux
lx
lm . m-2
m-2 . cd . sr
Activity
becquerel
Bq
s-1
(of a radionuclide)
Absorbed dose, specific
gray
Gy
J . Kg -1
m2 . s-2
e n e rg y i m p o r t e d , k e r m a ,
absorbed dose index
Dose equivalent
sievert
Sv
J . Kg-1
m2 . s-2
Catalytic activity
katal
kat
mol . s-1
(1) Special names for the unit of power: the name volt-ampere (symbol "VA") when it is used
to express the apparent power of alternating electric current, and var (symbol "var") when it
is used to express reactive electric power. The "var" is not included in GCPM resolutions.
Units derived from SI base units may be expressed in terms of the units listed in
Part I.
In particular, derived SI units may be expressed by the special names and symbols
given in the above table; for example, the SI unit of dynamic viscosity may be
expressed as m-1 . kg . s-1 or N . s . m-2 or Pa . s.
1.3 Prefixes and their symbols used to designate certain decimal multiples
and submultiples
Factor
1024
1021
1018
Prefix
yotta
zetta
exa
Symbol
Y
Z
E
Factor
10-1
10-2
10-3
Prefix
deci
centi
milli
Symbol
d
c
m
CAP. 454.]
18
10 15
10 12
109
10 6
103
10 2
10 1
METROLOGY
peta
tera
giga
mega
kilo
hecto
deca
10-6
10-9
10-12
10-15
10-18
10-21
10-24
P
T
G
M
k
h
da
micro
nano
pico
femto
atto
zepto
yocto
m
n
p
f
a
z
y’
The names and symbols of the decimal multiples and submultiples of the unit of
mass are formed by attaching prefixes to the word ‘gram’ and their symbols to the
symbol ‘g’.
Where a derived unit is expressed as a fraction, its decimal multiples and
submultiples may be designated by attaching a prefix to units in the numerator or the
denominator, or in both these parts.
Compound prefixes, that is to say prefixes formed by the juxtaposition of several
of the above prefixes, may not be used.
1.4 Special authorised names and symbols of decimal multiples and
submultiples of SI units
Quantity
Name
Volume
Mass
Pressure, stress
litre
tonne
bar
Unit
Symbol
l or L
t
bar
Value
1 l = 1 dm 3 = 10 -3 m3
1 t = 1 Mg = 10 3 kg
1 bar = 10 5 Pa
Note: The prefixes and their symbols listed in 1.3 may be used in conjunction with
the units and symbols contained in Table 1.4.
2.
UNITS WHICH ARE DEFINED ON THE BASIS OF SI UNITS BUT ARE
NOT DECIMAL MULTIPLES OR SUBMULTIPLES THEREOF
Quantity
Plane angle
Time
Name
revolution
grade or gon
degree
minute of angle
second of angle
minute
hour
day
Unit
Symbol
gon
min
h
d
Value
1 revolution = 2 rad
1 gon = /200 rad
1 = /180 rad
1 = /10800 rad
1 = /648000 rad
1 min = 60 s
1 h = 3600 s
1 d = 86400 s
Note: The prefixes listed in 1.3 may only be used in conjunction with the names
‘grade’ or ‘gon’ and the symbol ‘gon’.
3.
UNITS USED WITH THE SI, WHOSE VALUES IN SI ARE OBTAINED
EXPERIMENTALLY
Quantity
Name
Unit
Symbol
Definition
[ CAP. 454.
METROLOGY
Energy
Electronvolt
eV
Energy
Unified atomic mass unit
u
19
The electron volt is the kinetic
energy acquired by an electron in
passing through a potential
difference of 1 volt in vacuum
The unified atomic mass unit
is equal to 1/12 of the mass of an
atom of the nuclide 12C.
Note: The prefixes and their symbols listed in 1.3 may be used in conjunction with
these two units and with their symbols.
4.
UNITS AND NAMES OF UNITS PERMITTED IN SPECIALISED FIELDS
ONLY
Quantity
Unit
Name
dioptre
metric carat
are
Symbol
Vergency of optical systems
Mass of precious stones
Area of farmland and
building land
Mass per unit length of textile
tex
yarns and threads
Blood pressure and pressure
Millimetre of
of other body fluids
mercury
Effective cross-sectional area
Barn
a
Value
1 dioptre = 1 m-1
1 metric carat = 2 x 10-4 kg
1 a = 102 m2
tex
1 tex = 10-6 kg . m-1
mm Hg
b
1 mm Hg = 133.322 Pa
1 b = 10 –28 m2
Note: The prefixes and their symbols listed in 1.3 may only be used in conjunction
with the above units and symbols, with the exception of the millimetre of mercury
and its symbol. The multiple 102 a is, however, called a ‘hectare’.
5.
COMPOUND UNITS
Combination of the units listed in this Schedule to this Act form compound units.
SECOND SCHEDULE
(Article 14)
MEASURES AND WEIGHTS LAWFUL FOR USE
FOR THE PURPOSE OF TRADE IN MALTA
LINEAR MEASURES
Table I: Measures of 50 metres
30 metres
20 metres
10 metres
5 metres
3 metres
2 metres
1.5 metres
1 metre
0.5 metre
1 decimetre
1 centimetre
SQUARE MEASURES
Measures of, or of any multiple of, 1 square decimetre.
20
CAP. 454.]
METROLOGY
CUBIC MEASURES
1.
Measures of, or any multiple of, 0.1 cubic metre.
2.
Measures of any multiple of 10 litres.
3.
Table II: Measures of 10 litres
5 litres
2.5 litres
2 litres
1 litre
500 millilitres
250 millilitres
200 millilitres
100 millilitres
50 millilitres
25 millilitres
20 millilitres
10 millilitres
5 millilitres
2 millilitres
1 millilitre
CAPACITY MEASURES
1.
Measures of any multiple of 10 litres
2.
Table III: Measures of 10 litres
5 litres
2.5 litres
2 litres
1 litre
500 millilitres
250 millilitres
200 millilitres
175 millilitres
150 millilitres
125 millilitres
100 millilitres
50 millilitres
25 millilitres
20 millilitres
10 millilitres
5 millilitres
2 millilitres
1 millilitre
WEIGHTS
1.
Table IV: Weights of 25 kilograms
20 kilograms
10 kilograms
5 kilograms
2 kilograms
1 kilogram
500 grams
200 grams
100 grams
50 grams
20 grams
15 grams
10 grams
3 grams
2 grams
1 grams
500 milligrams
400 milligrams
300 milligrams
200 milligrams
150 milligrams
100 milligrams
50 milligrams
20 milligrams
10 milligrams
5 milligrams
[ CAP. 454.
METROLOGY
5 grams
4 grams
2.
21
2 milligrams
1 milligram
Table V: Weights of 500 carats (metric)
200 carats (metric)
100 carats (metric)
50 carats (metric)
20 carats (metric)
10 carats (metric)
5 carats (metric)
2 carats (metric)
1 carat (metric)
0.5 carat (metric)
0.25 carat (metric)
0.2 carat (metric)
0.1 carat (metric)
0.05 carat (metric)
0.02 carat (metric)
0.01 carat (metric)
THIRD SCHEDULE
(Article 14)
GENERAL INFORMATION ON METRIC EQUIVALENTS
TABLE
(a) of the values of the principal denominations of measures and weights on the
metric system expressed by means of denominations of Maltese and Imperial
measures and weights; and
(b) of the values of the principal denominations of measures and weights of the
Maltese and Imperial systems expressed by means of metric weights and measures.
(a)
MEASURES OF LENGTH
Metric
Measures
Equivalents in Imperial
Equivalents in Maltese
Measures
Measures
Miles Yards Feet Inches
Decimals
Qasab Xbar
Decimals
1 Kilometre
1093
1
10
113
477
1
70792
1 Hectometre
109
1
1
0113
47
5
770792
1 Decametre
10
2
9
70113
4
6
1770792
1 Metre
3
3
370113
3
81770792
1 Decimetre
3
9370113
38177079
1 Centimetre
39370113
038177079
1 Millimetre
039370113
0038177079
MEASURES OF SURFACES
Metric Measures
1 Hectare
1 Are
1 Square Metre
Equivalents in Imperial
Measures
2.47106 Acres
119.60 Square yards
1.1960 Square yards
Equivalents in Maltese
Measures
.555988 ta’ Modd
.53375 ta’ Sieg]
.053375 ta’ Kejla
or .22773 ta’ Qasba Kwadra
CAP. 454.]
22
METROLOGY
1 Square decimetre
1 Square centimetre
15.5 Square inches
.15500 Square inches
.14575 ta’ Xiber kwadru
.0014575 ta’ Xiber kwadru
MEASURES OF CAPACITY FOR LIQUIDS – No. 1
For Beer, Wine and Spirits
Metric
Measures
Equivalents in Imperial
Equivalents in Maltese
Measures
Measures
Gallons Quarts Pints
Decimals Bramel {arar Kwarti Krate`
Decimals
1 Kilolitre
219
3
1
80
23
0
1
1
15155504
1 Hectolitre
21
3
1
980
2
1
0
2
490155504
1 Decalitre
2
0
1
5980
1
4
0490155504
1 Litre
1
75980
879901555
1 Decilitre
175980
0879901555
1 centilitre
0175980
00879901555
1 Millilitre
00175980
000879901555
MEASURES OF CAPACITY FOR LIQUIDS – No. 2
For Oil and Milk
Metric
Measures
Equivalents in Imperial
Measures
Gallons Quarts Pints
Decimals
1 Kilolitre
219
3
1
80
1 Hectolitre
21
3
1
980
1 Decalitre
2
0
1
5980
1 Litre
1
75980
1 Decilitre
175980
1 Centilitre
0175980
1 Millilitre
00175980
Kaffisi
48
4
-
Equivalents in Maltese
Measures
Kwarti Krate`
Decimals
3
2
1347152
3
2
21347152
1
3
821347152
7821347152
07821347152
007821347152
0007821347152
MEASURES OF CAPACITY FOR DRY GOODS
Metric
Measures
Equivalents in Imperial
Measures
Qrs. Bushels Gallons
Decimals
1 Kilolitre
3
3
3
975
1 Hectolitre
2
5
9975
1 Decalitre
2
19975
1 Litre
1 Decilitre
1 Centilitre
1 Millilitre
-
-
-
219975
0219975
00219975
000219975
Equivalents in Maltese
Measures
Mdied Tmiem Sieg]an
Decimals
3
6
5
58
5
2
958
3
29962464
-
-
-
329962464
0329962464
00329962464
000329962464
CUBIC MEASURES
Metric Measures
1 Cubic metre
Equivalents in Imperial
Measures
1.307954 Cubic yards
35.3148 Cubic feet
Equivalents in Maltese
Measures
55.64278 Xbar kubi
or
.1086773 ta’ Qasba kuba
[ CAP. 454.
METROLOGY
1 Cubic decimetre
0353148 Cubic feet
1 Cubic centimetre
.061024 Cubic inches
23
.0556427 ta’ Xiber kubu
or
.0001086773 ta’ Qasba kuba
.0000556427 ta’ Xiber kubu
WEIGHTS
Metric
Weights
Cwts.
1
100 Kilograms
(1 quintal)
Kilogram
1 Hectogram
1 Decagram
1 Gramme
1 Decigram
1 Centigram
1 Milligram
Equivalents in Imperial
Weights
Qrs.
Lbs.
Decimals
3
24
46223
-
-
2
-
2046223
22046223
022046223
0022046223
00022046223
000022046223
0000022046223
Equivalents in Maltese
Weights
Qnatar Irtal Ewieq
Decimals
1
25
29
3525
-
1
-
7
3
-
79352
77935
377935
0377935
00377935
000377935
0000377935
(b)
MEASURES OF LENGTH
Maltese
Measures
Equivalents in Imperial
Measures
Feet
Inches
Decimals
6
10
50
1 Qasba
(8 ixbar)
1 Xiber
1 Pulzier
1 Mil
5280
10
equal to
Equivalents in Metric
Measures
Metres
Decimal
2
09549817
3125
859375
yds. 1760
1609
or
kilometres
26193727
021828105
334
1.6093
MEASURES OF SURFACE
Maltese
Measures
Acres
1 Modd
1 Tomna
1 Sieg]
1 Kejla
1 Qasba kwadra
1 Xiber kwadru
4
-
Equivalents in Imperial
Measures
Roods Poles
Sqr.
Sqr.
Yards
Feet
1
31
3
3
1
4
13
3
7
12
2
22
3
5
2
-
Equivalents in metric
Measures
Decimals
249
9
916
6
265625
7385162
1.798599928 hectares
11.2412495 acres
187.35416 Sqr. Metres
18.735416 Sqr. Metres
4.3911126 Sqr. Metres
6.8611 Sqr. Decimetres
MEASURES OF CAPACITY FOR LIQUIDS – No. 1
24
CAP. 454.]
METROLOGY
For Beer, Wine and Spirits
Maltese Measures
1 Barmil (4 [arar)
1 {arra (2 kwarti)
1 Kwarta ( 3/4Krate`)
1 Karto`` (2 infas)
1 Nofs (2 terzi)
1 Terz (2 pinet)
1 Pinta
Equivalents in Imperial
Measures
Gallons
Decimals
9
50
2
375
1
1875
2500
1250
0625
03125
Equivalents in metric
Measures
Litres
Decimals
43
18664945
10
7966623625
5
39833118125
1
13649077500
56824538750
28412269375
142061346875
MEASURES OF CAPACITY FOR LIQUIDS – No. 2
For Oil and Milk
Maltese Measures
1 Qafiz (4 kwarti)
1 Kwarta ( 3/4 Krate`)
1 Karto`` (2 infas)
1 Nofs (2 terzi)
1 Terz (2 kejliet)
1 Kejla (4 kwartini)
1 Kwartin
Equivalents in Imperial
Measures
Gallons
Decimals
4
50
1
125
28125
140625
0703125
028125
00703125
Equivalents in metric
Measures
Litres
Decimals
20
45683395
5
1142084875
1
278552121875
6392760609375
31963803046875
1278552121875
031963803046875
MEASURES OF CAPACITY FOR DRY GOODS
Maltese Measures
1 Modd (16-il tomna)
1 Tomna (6 sieg]an)
1 Sieg] (10 kejliet)
1 Kejla (10 lumini)
1 Lumin
Equivalents in Imperial
Measures
Quarters
Decimals
1
0625
010416
0010416
00010416
Equivalents in Metric
Measures
Hectolitres
Decimals
2
90942
18183875
03030645
003030645
0003030645
CUBIC MEASURES
Maltese Measures
1 Qasab kubu
Equivalents in Imperial
Measures
324.9511 Cubic feet
Equivalents in Metric
Measures
9.201556 Cubic metres
[ CAP. 454.
METROLOGY
1 Xiber kubu
1 Pulzier kubu
.63467 Cubic feet
.63467 Cubic inches
25
17.9717 Cubic decimetres
10.4 Cubic centimetres
WEIGHTS
Maltese Measures
Equivalents in Imperial
Measures
Lbs.
Decimals
175
8
75
1
75
0583333
01458333
007291666
525
2240
-
1 Qantar or `ental (20 wi\na)
1 Wi\na (5 irtal)
1 Ratal (30 Maltese uqija)
1 Uqija (4 Kwarti)
1 Kwart (2 ottavi)
1 Ottav
1 Pe\ata (3 qnatar)
1 Ton (weight) 1280 (ratal)
Equivalents in metric
Measures
Kilograms
Decimals
79
37867525
3
9689337625
7937867525
026459558416
00661489604
003307444802
238
13602575
1016
-
FOURTH SCHEDULE
(Article 14)
NAMES AND SYMBOLS USED IN
THE INTERNATIONAL SYSTEM OF UNITS "SI"
1.
Definition
"SI" shall have the meaning assigned to it in article 2 of the Act.
2.
SI unit symbols
SI unit symbols (and also many non-SI unit symbols) are written as follows:
2.1. Roman (upright) type is used for the unit symbols. In general, unit symbols
are written in lower case, but, if the name of the unit is derived from the proper name
of a person, the first letter of the symbol is a capital. When the name of a unit is
spelled out, it is always written in lower case, except when the name is the first word
of a sentence or is the name "degree Celsius".
2.2. Unit symbols are unaltered in the plural.
2.3. Unit symbols are not followed by a full stop (period), except as normal
punctuation at the end of a sentence.
3.
Algebra of SI unit symbols
In accord with the general principles adopted by ISO/TC 12 (ISO 31), the
CIPM recommends that algebraic expressions involving SI unit symbols be
expressed in standard forms.
3.1. Half-high dots or spaces are used to express a derived unit formed from two
or more other units by multiplication.
Example: N · m or N m.
3.2
A solidus (oblique stroke, /), a horizontal line, or a negative exponent is
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METROLOGY
used to express a derived unit formed from two other units by division.
Example: m/s or m - s or m · s-1.
3.3. The solidus is not followed by a multiplication sign or by a division sign on
the same line unless ambiguity is avoided by parentheses. In complicated cases,
negative exponents or parentheses are used to avoid ambiguity.
Examples: m/s2 or m · s-2 but not m/s/s
m · kg/(s3 · A) or m · kg · s-3 · A -1 but neither m · kg/s3 /A
nor m · kg/s3 · A.
4.
Rules for using SI prefixes
In accord with the general principles adopted by the ISO (ISO 31), the CIPM
recommends that the following rules be observed when using the SI prefixes:
4.1. Prefix symbols are printed in roman (upright) type with no space between
the prefix symbol and the unit symbol.
4.2. The grouping formed by the prefix symbol attached to the unit symbol
constitutes a new inseparable symbol (of a multiple or submultiple of the unit
concerned) which can be raised to a positive or negative power and combined with
other unit symbols to form compound unit symbols.
Examples:
1 c m3 = (10-2 m )3 = 10-6 m3
1 μ s-1 = (10-6 s )-1 = 106 s -1
1 V/cm = (1 V) / (10-2 m) = 102 V / m
1 cm-1 = (10-2 m)-1 = 102 m -1.
4.3. Compound prefixes, i.e. prefixes formed by the juxtaposition of two or more
SI prefixes, are not used.
Example: 1 nm but not 1 mμm.
4.4. A prefix is never used in isolation.
Example: 106 /m 3 but not M/m3.
AI explanation based on the official legal text. Indicative, not a substitute for legal advice.