# The Measuring Instruments Regulations 2016, Paragraph 3.1.3


The critical change value is the smaller of the two following values:
— the quantity corresponding to half of the magnitude of the MPE in the upper zone on the measured volume;
— the quantity corresponding to the MPE on the quantity corresponding to one minute at maximum flowrate.

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Source: https://www.legislation.gov.uk/uksi/2016/1153/schedule/1D/paragraph/3.1.3 (the official version)
Page: https://openlegislation.uk/measuring-instruments-regulations-2016/schedule-1D/paragraph-3.1.3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.