The HANNA® HI 99556-00 digital infrared thermometers employs infrared technology to measure the surface temperature. Infrared thermometer measurements are extremely practical with a fast response time, typically around 1 second. The advantage is the non-intrusive nature of the measurements. This latter feature is particularly attractive in the food industry since it translates practicality into substantial savings by leaving products intact, especially those sealed or pre-wrapped.In order to measure the temperature, simply point to the product or target and hold down the measurement key. Readings are immediately displayed on the LCD. This type of non-intrusive measurement is also useful when the surface temperature is too high to approach, for difficult-to-reach places or due to hygiene requirements. These HANNA® infrared thermometers are particularly attractive for food distribution, retailing and supermarkets. The optional HANNA® rubber boot will make the meter truly shockproof. If in addition to surface measurement, you must check the core temperature too, then HI 99556-00 is the ideal solution for you. Simply attach an optional external probe to the meter and you have a 2-in-1 infrared-thermistor thermometer. Hanna #: HI 99556-00. Range (IR): -10 to 300°C ("-00" models); 14 to 572°F ("-01" models); -20 to 199.9°C ("-10" models) Range (Probe): -40 to 150°C Resolution (IR): 1°CResolution (Probe): 0.1°C Accuracy (IR): ±2% or ±2°CAccuracy (Probe): ±0.5°C -20 to 120°C); ±0.5°C+1% of reading (outside) IR Sensor Response Time: 1 second IR Sensor Optic Coefficient: 3:1 (ratio of distance to target diameter) Minimum Distance: 30 mm (1.2") Temperature Probe: HI 765PW (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") HI 99556-00 is supplied with battery and instructions.