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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.
When you place a thermometer inside the oral cavity (the mouth, silly), you are actually finding out the oral temperature. Axillary temperature is taken by placing the thermometer under the armpits of a person. A thermometer designed for oral use can also be used for measuring the axillary temperature.