# The Non-automatic Weighing Instruments (EEC Requirements) Regulations 1993, Paragraph 1: Units of mass


The units of mass used shall be the legal units within the meaning of Directive 80/181/EEC, as last amended by Directive 85/1/EEC.
Subject to compliance with this condition, the following units are permitted:
SI units: kilogram, microgram, milligram, gram, tonne,
Imperial units: pound, ounce (avoirdupois), troy ounce,
other non-SI units: metric carat, if weighing precious stones.
For instruments that make use of the Imperial units of mass referred to above, the relevant essential requirements specified below shall be converted to the said Imperial units, using simple interpolation.

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Source: https://www.legislation.gov.uk/uksi/1992/1579/schedule/2/paragraph/1n3 (the official version)
Page: https://openlegislation.uk/non-automatic-weighing-instruments-eec-requirements-regulations-1993/schedule-2/paragraph-1n3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.