Weights and Measures Regulations (C.R.C., c. 1605)

178 (1) An electronic machine shall perform within the applicable limits of error, when tested after being calibrated and zeroed, under relative humidity conditions between 10 per cent and 95 per cent, and under one of the following operating conditions:

• (a) the ambient temperature range is -10°C to +40°C, unless expressly specified otherwise on the approval application and marked on the machine;

• (b) if the specified minimum temperature is lower than -10°C or the specified maximum temperature is more than +40°C, the machine shall bear markings specifying the minimum and maximum temperatures and shall be approved for use within this expanded temperature range, if Measurement Canada laboratories are equipped to test at those temperatures;

• (c) when a machine meets the conditions described in paragraphs (a) and (b), it may be used beyond the approved minimum and maximum temperatures if it continues to perform within allowable limits of error; or

• (d) if the specified minimum temperature is higher than -10°C or the specified maximum temperature is less than +40°C, the machine shall bear markings specifying the minimum and maximum temperatures and shall only be approved for use within this reduced temperature range.

(2) The difference between the specified minimum and maximum temperatures for an electronic machine shall not be less than

• (a) 5°C for machines with more than 50,000 increments of registration;

• (b) 15°C for machines used to weigh precious metals and other commodities of comparable value; and

• (c) 30°C for machines used to weigh commodities other than precious metals or commodities of comparable value.

(3) An electronic machine shall perform within the applicable limits of error when tested at a constant ambient temperature that does not vary more than 5°C.