The instrument has the characteristics of high temperature sensitivity, intuitive thermal image, wide detection range, fast speed, no interference with the measured target, safe use, etc., and the temperature resolution can reach 0.2C. As long as the target to be measOured passes quickly within the detection range of the infrared lens, the instrument can recognize the human face, immediately display the thermal image of the human body and the highest body surface temperature, and the operator can obtain accurate data. In case of suspicious fever patients, the instrument will immediately report to the police to effectively prevent cross infection of human flow.