The location of the forehead, wrist and neck where the body temperature is measured with the forehead temperature gun is generally accurate, and the wrist temperature is generally more accurate than the forehead temperature because the wrist is wrapped in clothes and the body temperature is relatively constant, which makes the measurement results more accurate. The forehead temperature is influenced by the ambient temperature and blood circulation, if the outside temperature is high or direct sunlight, the forehead temperature will rise accordingly, if the outside temperature is low or just blowing cold wind, the forehead temperature will be low again. Therefore, in winter, if the outdoor temperature is low and windy, it is recommended to measure the neck, wrist and other relatively warm locations, because these two locations are wrapped in clothes, body temperature is relatively constant, the measurement results are relatively accurate.