# The Milk (Special Designations) (Scotland) Order 1988, Paragraph 11


(1) For each occasion on which such equipment is in operation —
(a) the input temperature and the output temperature shall be indicated by indicating thermometers; and
(b) either both of these temperatures or one of them and the difference between them shall be continuously recorded on charts marked with graduations at intervals of 0.5degC. adequately spaced to give clear readings.
(2) The records on such charts shall be dated and shall be preserved for a period of not less than three months.

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Source: https://www.legislation.gov.uk/uksi/1988/2191/schedule/4/paragraph/11 (the official version)
Page: https://openlegislation.uk/milk-special-designations-scotland-order-1988/schedule-4/paragraph-11
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.