Pt100 digital thermometer models are widely recognized as the most accurate with the best stability, repeatability and linearity among digital thermometers. Add to this the 4-wire system that is practically impervious to lead-wire length error and you have a powerful tool to measure temperature accurately. Model HI 955501 accepts interchangeable HI 768 Pt100 probes which measure temperatures with 0.1°C resolution in the -199.9 to 199.9°C range and then automatically switch to 1°C from 200 to 850°C. Press RANGE and the resolution switches to 1°C at any time. A compact, ergonomic design and a wrist-strap make it easy to carry them anywhere in the lab or plant. Hanna #: 955501.Note: The shockproof boot is recommended to protect the meter during field measurments. Range: -199.9 to 199.9°C; 200 to 850°C.Resolution: 0.1°C (-199.9 to +199.9°C); 1°C (200 to 850°C).Accuracy: ±0.2°C and ±1 digit (-120.0 to 199.9°C); ±1°C and ±1 digit (-170 to 450°C); ±1% F.S. and ±1 digit (outside) (for 1 year, excluding probe error).Probe: HI 768 series, Pt100, stainless steel, 1 m (3.3') cable (not included) Battery Type / Life: 1 x 9V / approx. 150 hours of continuous use Environment: 0 to 50°C (32 to 122°F); RH max 95% Dimensions: 143 x 80 x 32 mm (5.6 x 3.2 x 1.5") Weight: 320 g (11.3 oz.). HI 955501 is supplied with battery and instructions.