If you look at the thermometer material, it can be divided into four types: glass mercury thermometer, electronic thermometer, infrared thermometer and chemical markers. There are five parts of the body that can be used to measure body temperature, namely the armpit, forehead, ear canal, mouth and rectum. The temperature measured by each thermometer is different, and different parts of the body have different fever standards. Glass mercury thermometers are the most accurate. The traditional glass mercury thermometer can be used to measure both underarm temperature and the temperature in the mouth and rectum. “If it is used to measure the oral or rectal temperature, it is important to make it a special meter for the child and to sterilize it with alcohol before and after use.” Underarm temperatures are usually considered feverish at over 37 degrees Celsius, while the standard for measuring oral and rectal fever is over 38 degrees Celsius (over 37.5 degrees Celsius in older children). It should be reminded that measuring oral and rectal temperatures is not recommended for children under 5 years of age because they are too young and the thermometer is easily chewed in the mouth, which not only stabs the child, but also leaks mercury that is more harmful to the child. When measuring the rectal temperature, the weight of the force and the depth of insertion are not easy to grasp, but also more dangerous. Electronic thermometers should be calibrated frequently. Electronic thermometers are easy to use, the measurement time is short, about 1 minute to get the results, more suitable for children who love to move. But these products also have a problem, is the need for frequent calibration. For families who cannot do this, the most important thing is for parents to get a good grasp of the basal body temperature measured with this temperature, for example, the child’s normal body temperature is 36.5 degrees Celsius, but with the electronic thermometer basal body temperature becomes 37 degrees Celsius, then every day as long as the child does not exceed this temperature is normal. Infrared ear canal thermometer is not suitable for infants. Infrared ear canal thermometer is similar to the electronic thermometer, except that it measures the temperature of the ear canal and is considered feverish if it exceeds 37 degrees Celsius. It should be reminded that ear canal thermometry is not recommended for infants under 3 months of age, because the child’s ear canal is delicate and can hurt the child. Infrared frontal thermometer is greatly affected by the ambient temperature. The forehead thermometer measures the temperature of the forehead. Theoretically, it is also considered a fever over 37 degrees Celsius. Although the forehead temperature is convenient to measure, but it is greatly influenced by the surrounding environment temperature, such as winter just returned from outside, the forehead temperature measurement must be very low; summer just after doing exercise in the sun, the forehead temperature will certainly be higher. Forehead temperature sticker temperature measurement is not specific. LCD forehead thermometer stickers such products belong to the chemical marker thermometer, directly paste in the child’s forehead, 1 minute or so, will show the temperature change through the color change. But this thermometer can not show the exact temperature, can only provide an approximate range, and is disposable, is not advocated.