Mercury thermometer can measure the temperature of different parts of the body, in measuring different parts of the body, the time required is different. The most commonly used is the axillary temperature measurement, the correct measurement method is to dry the armpit first, place the head end of the thermometer deep in the armpit, clamp the thermometer on the upper arm and take out the reading after 10 minutes. If the oral temperature is measured, the head end of the sterilized thermometer should be placed under the patient’s tongue, and the lips should be closed tightly, and the reading should be taken out after 5 minutes. When measuring the anal temperature, let the patient take a lateral position, and after applying an appropriate amount of lubricant to the head end of the anal thermometer, slowly insert it into the anus until it reaches half of the length of the thermometer, and take out the reading after 5 minutes. The normal value of temperature in different parts of the body is different. The normal value of axillary temperature is 36.0℃-37.0℃, the normal value of oral temperature is 36.3℃-37.2℃, and the normal value of anal temperature is 36.5℃-37.7℃.