With its high sensitivity, it can find out the right place of people?s body where they put their metal good. It also can be used together with walk-through metal detector. When the safe-exam gate detects the metal good, the hind-lifted metal detector will find out the right place where the metal goods is put. While inspecting people?s body, it use its square detecting coil with the detecting scope of 12 cm, which help the work of inspecting the whole body of people be finished in one time.