P-29, r. 1 - Regulation respecting food

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2.1.3.2. The premises or vehicle must be equipped with installations, areas or compartments sufficient to maintain the temperatures prescribed in section 1.4.1, and the operator must have a functioning thermometer that is precise to +-1ºC.
Every refrigerating or freezing installation, area or compartment must be equipped with a functioning thermometer or thermograph precise to +-1ºC that indicates the temperature in the warmest location.
O.C. 1573-91, s. 18.