Temperature gun is a measurement tool for human body temperature, easy to use, with the advantages of rapid temperature measurement, no contact, to avoid cross infection. The accurate measuring part of the temperature gun should be the forehead, and in special cases, the wrist can also be measured. When measuring the forehead area, the temperature gun should be aligned with the eyebrow position, 3-5cm from the forehead, to ensure that the forehead of the person being measured is clean and unobstructed. To ensure the accuracy of the measurement, try to keep the temperature gun and the subject in the same environment for 30 minutes before the measurement. If the outside ambient temperature is too low, the forehead is exposed to the outside world, resulting in inaccurate measurement of body temperature drop, then you can measure the wrist. The normal body temperature of the human body should be 36℃-37℃, if the body temperature exceeds 37.3℃ is fever, you need to carry out the appropriate cooling treatment, such as drinking more hot water, increase the body metabolism, etc.. If it exceeds 38.5℃, you need to go to the hospital fever clinic and take antipyretic drugs or other symptomatic and causal treatment under the guidance of the doctor. The temperature gun should usually remove the battery when not in use, put in a cool and dry place to avoid exposure to the sun, humidity and other environmental causes device aging, resulting in inaccurate measurement.