# The Measuring Instruments Regulations 2016, Paragraph 3.2


Measures made from material whose dimensions may alter materially when subjected to a wide range of relative humidity, may only be included in Classes II or III.

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Source: https://www.legislation.gov.uk/uksi/2016/1153/schedule/1I/part/chapter/1/paragraph/3.2 (the official version)
Page: https://openlegislation.uk/measuring-instruments-regulations-2016/schedule-1I/part/chapter-1/paragraph-3.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.