# The Weights and Measures (Local and Working Standard Capacity Measures and Testing Equipment) Regulations 1990, Regulation 18: Piston provers


(1) A piston prover shall have been tested over its full working range within 12 months before use.
(2) The error on a piston prover shall not exceed the limits of error shown in Schedule 2 to these Regulations.

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Source: https://www.legislation.gov.uk/uksi/1990/2626/regulation/18 (the official version)
Page: https://openlegislation.uk/weights-and-measures-local-and-working-standard-capacity-measures-and-testing-equipment-regulations-1990/regulation-18
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.