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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.
Now we can also use the IR thermometer to measure hard-to-reach objects instantly. An infrared thermometer may be called for anytime the surface temperature of an object needs to be determined. Obviously, since the infrared beam is only bouncing off of the surface, this is not a suitable method of measurement when the interior temperature of an object needs to be found.