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Infrared thermometers work very well when measuring the temperature of hot oil. For deep frying it's not a big deal, as standard probe thermometers work fine. But for shallow frying or sauteeing, the IR thermometer does an excellent job at providing the temperature of the oil.
They are sometimes called laser thermometers if a laser is used to help aim the thermometer, or non-contact thermometers or temperature guns, to describe the device's ability to measure temperature from a distance. non-adjustable thermometer may be used to measure the temperature of a reflective surface by applying a non-reflective paint or tape, with some loss of accuracy. A sensor with an adjustable emissivity setting can also be used to calibrate the sensor for a given surface, or to measure the emissivity of a surface.