To monitor water supply temperatures for the prevention of Legionella growth.12mm LCD display.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 0.4C 0.1%.Penetration temperature probe to record the temperature of tap water, ribbon Surface temperature probe for surface of pipes and tanks and wire probe for areas that are difficult to reach.Water Resistant Countdown Timer.Supplied with 1.5 volt AAA batteries - 10000hrs/5yr battery life.Mini tub of 35 Probe Wipes.ABS carrying case with Biomaster Antimicrobial technology.FREE traceable certificate of calibration.2 year guarantee.Employers or persons in control of premises are legally responsible for testing for Legionella.