The normal reading of an ear thermometer is 35.8-37.6°C, and temperatures within this range are normal. The ear thermometer is a device that measures the temperature of the ear to determine whether the patient has a fever, and is affected by changes in the surrounding temperature, as well as by changes in the temperature difference between the environment and the outside world. In a warm room in the thermometer to measure the temperature will be about 0.3 ℃ above the normal value, in a cold environment, the measurement of the ear temperature will be relatively low, the measurement of children’s body temperature, if the child is in a state of movement body temperature will also change. Ear thermometer measurement of body temperature is only a superficial human body temperature, can only be used as a reference, especially the error value of the ear thermometer is relatively large, the medical usually recommended to measure the armpit temperature or anal temperature as a judgement of whether the body temperature is elevated indicators.