# The Measuring Instruments Regulations 2016, Paragraph 1.3.2


(a) Mechanical environments are classified into classes M1 to M3 as described below.
M1
This class applies to instruments used in locations with vibration and shocks of low significance, e.g. for instruments fastened to light supporting structures subject to negligible vibrations and shocks transmitted from local blasting or pile-driving activities, slamming doors, etc.
M2
This class applies to instruments used in locations with significant or high levels of vibration and shock, e.g. transmitted from machines and passing vehicles in the vicinity or adjacent to heavy machines, conveyor belts, etc.
M3
This class applies to instruments used in locations where the level of vibration and shock is high and very high, e.g. for instruments mounted directly on machines, conveyor belts, etc.
(b) The following influence quantities shall be considered in relation with mechanical environments:
— vibration
— mechanical shock

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Source: https://www.legislation.gov.uk/uksi/2016/1153/schedule/1A/paragraph/1.3.2 (the official version)
Page: https://openlegislation.uk/measuring-instruments-regulations-2016/schedule-1A/paragraph-1.3.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.