# The Measuring Instruments Regulations 2016, Paragraph 1.3.4


Other influence quantities to be considered, where appropriate, are:
— voltage variation;
— mains frequency variation;
— power frequency magnetic fields;
— any other quantity likely to influence in a significant way the accuracy of the instrument.

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Source: https://www.legislation.gov.uk/uksi/2016/1153/schedule/1A/paragraph/1.3.4 (the official version)
Page: https://openlegislation.uk/measuring-instruments-regulations-2016/schedule-1A/paragraph-1.3.4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.