Ear temperature gun is a new instrument for measuring body temperature, usually the ear temperature gun measures the temperature sensed by the infrared rays emitted by the periosteum, the temperature range is between 35.8-38 ℃, more than 0.5 ℃ of the normal temperature is considered fever. Ear temperature gun in the measurement of children due to the baby’s uncooperative nature affects the normal measurement of temperature, so more to take in the environment room temperature is normal, the baby quiet state, such as after feeding one ear measurement 3 times, take the average. Ear temperature gun measurement has the advantages of speed and digitalization, usually before the application of the ear temperature gun should be disinfected to the ear sleeve, if the ear sleeve is broken in long-term application should be replaced regularly. The ear temperature gun is a more sensitive instrument and is left at room temperature for 20 minutes before being used for measurement.