Specification Fluke 54 II B Temperature accuracy Above -100 °C: J, K, T, E, and N-type: ±[0.05% + 0.3°C] R and S-type: ±[0.05% + 0.4°C] Below -100 °C: J, K, E, and N-types: ±[0.20% + 0.3°C] T-type: ±[0.50% + 0.3°C] Temperature J-type: -210 °C to 1200 °C K-type: -200 °C to 1372 °C T-type: -250 °C to 400 °C E-type: -150 °C to 1000 °C N-type: -200 °C to 1300 °C R and S-type: 0 °C to 1767 °C Temperature scale ITS-90 Applicable standards NIST-175 Display Resolution 0.1 °C, 0.1 K < 1000 1°C, 1 K >=1000 Environmental Specifications Operating Temperature -10 °C to 50 °C Storage Temperature -40 °C to 60 °C Humidity (Without Condensation) 0% to 90%; 0 °C to 35 °C 0% to 70%; 0 °C to 50 °C Safety Specifications Overvoltage category CSA C22.2 No. 1010.1 1992; EN 61010 Amendments 1,2 Agency Approvals CE, CSA, TÜV (pending) Mechanical and General Specifications Size 173 mm L x 86 mm W x 38 mm Weight 400 g Batteries 3 AA batteries; typical 1000-hour life