Forehead temperature and ear temperature both belong to superficial temperature, relatively speaking, forehead temperature is more accurate when measuring because the contact area of forehead is relatively larger, but both forehead temperature and ear temperature are easily disturbed by external conditions, for example, forehead temperature and ear temperature are especially susceptible to change when measured by the influence of external climate temperature, in summer when outdoor temperature is very high, measuring forehead temperature and In summer, when the outdoor temperature is very high, the forehead temperature and ear temperature will be relatively high, and in winter, when the outdoor temperature is relatively low, the forehead temperature and the second degree temperature will be relatively low. In addition, when measuring the forehead temperature, the patient must aim at the forehead, because the forehead is relatively large when measuring the skin heat dissipation area, so the temperature difference with the back of the head when measuring the temperature will be 0.3-0.5 ℃. Therefore, when measuring the body temperature is relatively strict, it is usually not recommended to measure the forehead and ears, but the axilla or anus, to take the deep body temperature is relatively more accurate.