Page "Thermometer" Paragraph 48

According to British Standards, correctly calibrated, used and maintained liquid-in-glass thermometers can achieve a measurement uncertainty of ± 0. 01 ° C in the range 0 to 100 ° C, and a larger uncertainty outside this range: ± 0. 05 ° C up to 200 or down to − 40 ° C, ± 0. 2 ° C up to 450 or down to − 80 ° C.