Metal detectors are real in our daily life. They are usually used for people screening, from leisure and entertainment to work to safety, and they are widely used. Now it is widely used in airports, office buildings, schools, government agencies, prisons and other places. Metal detectors can help improve the safety of these places by people screening and other related work. There are many kinds of metal detectors, such as microwave human body scanner, hand-held metal detectors, safety doors and so on. These devices can be used for people screening in public places. At this time, there must be a question: is the metal detector really convenient? Next, we will make a brief analysis of this question. I hope it will help you better understand the devices that can be used for people screening.