# The Weights and Measures (Local and Working Standard Capacity Measures and Testing Equipment) Regulations 1990, Regulation 5: Reference meters


(1) Reference meters shall be tested either—
(a) by means of a local or working standard capacity measure which is of sufficient size to hold at least one minute’s delivery of the meter under test; or
(b) by means of a weighing machine, the repeatability of which shall be not more than 0.01 per cent of the weight of the liquid delivered by the water under test, and which can weigh at least one minute’s delivery of the meter under test.
(2) The capacity measure or the weighing machine used to test a reference meter shall have a discrimination threshold of not more than 0.01 per cent of the quantity delivered by the meter under test.
In a test under sub-paragraph (1)(b) above, the density of the test liquid shall be determined to an accuracy of 0.01 per cent.

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Source: https://www.legislation.gov.uk/uksi/1990/2626/regulation/5 (the official version)
Page: https://openlegislation.uk/weights-and-measures-local-and-working-standard-capacity-measures-and-testing-equipment-regulations-1990/regulation-5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.