# The Measuring Instruments Regulations 2016, Paragraph 5.3


Any percentage of air or gas not easily detectable in the liquid shall not lead to a variation of error greater than:
— 0.5 % for liquids other than potable liquids and for liquids of a viscosity not exceeding 1 mPa.s, or
— 1 % for potable liquids and for liquids of a viscosity exceeding 1 mPa.s.
However, the allowed variation shall never be smaller than 1 % of MMQ. This value applies in the case of air or gas pockets.

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Source: https://www.legislation.gov.uk/uksi/2016/1153/schedule/1F/paragraph/5.3 (the official version)
Page: https://openlegislation.uk/measuring-instruments-regulations-2016/schedule-1F/paragraph-5.3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.