# The Measuring Instruments Regulations 2016, Paragraph 4


(1) Where a cold water meter is marked with—
(a) a temperature range, it must not be used for trade in temperatures outside that range; or
(b) a flowrate range, it must not be used at a flowrate outside that range.
(2) Where a cold-water meter bears a mark which signifies the manner and purposes of use, it must not be used for trade in a manner or for a purpose which does not accord with that marking.
(3) A cold water meter must not be used for trade in circumstances—
(a) in which it may be prevented from operating consistently or accurately; or
(b) which are likely prematurely to degrade its metrological characteristics.
(4) A cold-water meter must not be used for trade unless, when adjusted, the calibration of the instrument is set as close to zero as practicable.

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Source: https://www.legislation.gov.uk/uksi/2016/1153/schedule/6/paragraph/4 (the official version)
Page: https://openlegislation.uk/measuring-instruments-regulations-2016/schedule-6/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.