P-29, r. 1 - Regulation respecting food

Full text 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.