Normal Braun ear thermometer readings are normally between 35.8 and 37.6°C. The above ear thermometer measurements are subject to changes in ambient temperature, as well as changes in the environment and outside temperature differences. In a warm room the temperature measured by the ear thermometer will be 0.3°C higher than the normal value, and if the ear temperature is measured in a cold environment or in an air-conditioned room in summer, the ear temperature will be relatively lower. In summer, when the outdoor air temperature is high, the ear temperature will change frequently, and if the temperature is measured in children, the temperature will also change during movement. Therefore, usually ear temperature measurement body temperature value, only belongs to the human body surface shallow temperature can only be used as a reference, but medical also recommended to use the axillary temperature and measurement of anal temperature as an indicator to determine whether the body temperature increases.