The ear temperature gun is a non-contact telemeter (though perhaps less than a centimeter) that uses the The ear temperature gun is a non-contact telemeter (though perhaps less than a centimeter) that uses the infrared spectrum from the tympanic membrane (equivalent to the hypothalamus) to determine the body temperature, according to the blackbody radiation theory. spectrum from the tympanic membrane (equivalent to the hypothalamus) to determine the body temperature, according to the blackbody radiation theory.
