Monitor water supply temperatures for prevention of Legionella growth.Easy-to-use therma 1 industrial thermometer with K thermocouple sensor.Temperature range: -99.9 - +1372 °C with a 0.1 °C or 1 °C resolution. Accuracy to ±0.4°C ±0.1%.Immersion probe, ribbon surface temperature probe for surface of pipes and tanks and heavy duty PTFE wire probe for difficult to reach areas.Supplied with 1.5 volt AAA batteries - 10000hrs/5yr battery life.ABS protective PVC zip pouch with Biomaster Antimicrobial technology.FREE traceable certificate of calibration.2 year guarantee.