The thermometer needs to be clamped for 5-10 minutes when measuring body temperature. Normal body temperature is a necessary condition for the survival of human beings. Excessively high and low body temperatures are detrimental to the normal physiological activities of the human body, and may even cause serious effects and tissue and organ dysfunction. Therefore, in the event of disease, especially infectious diseases, often need to carry out temperature measurement to understand the body temperature, to determine the presence of fever symptoms. Most measurements of body temperature use mercury thermometers, and the sites of choice are the oral cavity, axilla, and rectum, with the most commonly used site in clinical practice being the axilla. The mercury thermometer is clamped using a mercury thermometer and measured by conduction through an object. This physical conduction process is relatively slow, so close contact is required for a sufficient period of time for two neighboring objects to reach a consistent temperature for accurate measurement. Therefore, more than 5-10 minutes should be used, too short a period of time to measure the body temperature is low, too long time is not necessary.