There are three measurement points for normal adults when measuring body temperature, such as with a mercury meter, usually the oral cavity, axilla and anus, and there is no difference where the measurement is most accurate because the basic reference value is different at each measurement point. Usually the body temperature of 36.3℃-37.2℃ is normal when the temperature is measured in the oral cavity. The normal value of body temperature when measuring temperature in the armpit is 36.0-37.0°C. The standard body temperature is highest when the temperature is measured in the anus, which is usually 36.5℃-37.7℃. All the above three sites for temperature measurement are standard measurement sites, only the reference values are slightly different. Infrared thermometers can also be used to measure body temperature. Infrared thermometers are most accurate in measuring the ear canal tympanic membrane.