Although no infrared ear thermometer can predict the precise readings you'd get at these sites, it can translate the tympanic temperatures into these more familiar frames of reference. Using an infrared ear thermometer requires some training, just as any instrument does. Many of these thermometers have alarm features that alert the user if temperatures are outside the instrument's range, if a new cover hasn't been put on the probe, or if new batteries are needed to continue providing accurate readings. Infrared readings shouldn't be taken immediately following ear-canal treatments that might alter the temperature through evaporation or increased blood flow. Infrared ear thermometers require special care.
Accurate readings depend on keeping the probe tip clean, usually with a dry lens wipe or a tissue.
If the manufacturer advises cleaning the tip with a cotton swab dipped in isopropyl alcohol, be sure to squeeze out the excess alcohol and keep the probe facing down so no alcohol seeps in behind it. After drying the tip with a tissue, wait 30 minutes before using the thermometer to let it adjust from the cooling effect of the alcohol. This includes heating and air-conditioning vents, open windows or doors, strong lights, and computers and printers that give off heat.