The non-contact pyroelectric infrared thermometer is a new type of infrared thermometer that uses the pyroelectric effect. Compared with other traditional thermometers, it has the advantages of working at room temperature without refrigeration, wide spectral response, high sensitivity, fast response speed, and strong anti-interference ability. When measuring human body temperature, it is usually pointed at the forehead or wrist. This is because the forehead is where the temporal artery flows, and the skin is thin, small, and exposed, making it the best non-contact observation point for the body's internal temperature. In addition, places where blood vessels are not hidden, such as the wrist and neck, can also be used as body temperature capture points.

All objects above absolute zero radiate infrared light by themselves. The function of the infrared thermometer is to collect the infrared rays emitted by the object. It does not emit any harmful radiation at all, so it is completely harmless to the human body. Some people misunderstand that infrared thermometers emit radiation at the human body to produce readings, which is wrong.