# The Weighing Equipment (Non-automatic Weighing Machines) Regulations 1988, Paragraph 13


Price-to-pay testing
(a) By checking with several different weights and unit prices, the inspector shall satisfy himself that the machine computes the price-to-pay correctly.
(b) In the case of a machine with digital indication or printing of price-to-pay, the price computation shall be deemed to be correct if the difference between any indicated or printed price-to-pay and the product of its associated unit price and indicated or printed weight is not greater than half the value of the smallest monetary unit.

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Source: https://www.legislation.gov.uk/uksi/1988/876/schedule/3/paragraph/13 (the official version)
Page: https://openlegislation.uk/weighing-equipment-non-automatic-weighing-machines-regulations-1988/schedule-3/paragraph-13
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.