Sch 6 para 7
The instruments shall meet the metrological requirements within the temperature range specified by the manufacturer. The value of this range shall be at least equal to— (a) 5 °C for an instrument in class I; (b) 15 °C for an instrument in class II; (c) 30 °C for an instrument in class III or IIII. In the absence of a manufacturer's specification, the temperature range of – 10 °C to + 40 °C applies.