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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.
Laser thermometers are actually infrared thermometers. The laser is just there to make the thermometer easier to aim. Molecules are vibrating constantly; the hotter the molecule is, the faster it vibrates, creating infrared energy. Infrared (IR) thermometers measure the infrared energy given off by all objects.