After the electronic thermometer sounds, the temperature has been equal to the body’s temperature, the thermometer finished measuring the work of the prompt, so there is no need to continue to measure. The electronic thermometer also uses the principle of infrared and electronic temperature measurement, the overall body temperature measurement. Usually the electronic thermometer is equipped with an electrothermal conductive wire, which converts the signal of human body temperature and thermal energy into a digital signal displayed on the thermometer. Usually with the thermometer temperature measurement, with the armpit should stay for about 10 minutes, the normal body temperature value than the value measured with the mercury thermometer, to slightly higher than 0.1 ℃, this is to pay attention to.