I believe that now when you go out to play on the subway or take a bus to other places, before we enter the station, there will be staff members to carry out security checks on us and our belongings. This is actually a people screening method. So, do you know the equipment these employees use to conduct security checks on us? This is actually a metal detector. Metal detector is a metal detection device. The system can use alarm signal to drive automatic cleaning device to remove metal impurities in the production line. Therefore, through these devices, employees can do people screening for us. The following article briefly introduces and compares the stepping metal detector and the hand-held metal detector, hoping to let you know more about the metal detector, which is one of the equipment used for people screening .