# Directive 2014/32/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of measuring instruments (recast) (Text with EEA relevance), Division 3.1.3: The critical change value is the smaller of the two following values:

Extent: E+W+S+N.I.

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/eudr/2014/32/annex/IV/part/I/division/3/division/3.1/division/3.1.3 (the official version)
Page: https://openlegislation.uk/eu-directive-2014-32/annex-IV/part-I/division-3/division-3.1/division-3.1.3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.