# The Measuring Equipment (Measures of Length) Regulations 1986, Regulation 22

Extent: E+W+S

Every measure of length shall be tested by comparison with an appropriate local or working standard linear measure using equipment and under conditions which are appropriate to the degree of accuracy required, taking the following factors into account—
(a) the ambient temperature, when the standard and the measure of length being compared are of different materials;
(b) the tensioning and support of flexible measures of length; and
(c) the method of magnification for viewing.

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Source: https://www.legislation.gov.uk/uksi/1986/1682/regulation/22 (the official version)
Page: https://openlegislation.uk/measuring-equipment-measures-of-length-regulations-1986/regulation-22
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.