# The Low Emission Zones (Scotland) Regulations 2021, Paragraph 3


The device and visual counter must be—
(a) synchronised with a suitably independent national standard clock, and
(b) accurate within plus or minus 10 seconds over a 14-day period and re-synchronised to the suitably independent national standard clock at least once during that period.

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Source: https://www.legislation.gov.uk/ssi/2021/26/schedule/6/paragraph/3 (the official version)
Page: https://openlegislation.uk/low-emission-zones-scotland-regulations-2021/schedule-6/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.