# The Penalty Charges (Prescribed Devices) Regulations (Northern Ireland) 2014, Paragraph 3


The device and visual counter must—
(a) be synchronised with a suitably independent national standard clock; and
(b) be 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.

---
Source: https://www.legislation.gov.uk/nisr/2014/279/schedule/paragraph/3 (the official version)
Page: https://openlegislation.uk/penalty-charges-prescribed-devices-regulations-northern-ireland-2014/schedule/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.