SIVA UPD-004 has FOUR multiple separate overlapping metal detectors in one frame. This coil structure enhances the metal detection process compared to conventional metal detectors. Metal location is reliably displayed at each zone. If metal are present in morethan one zone, all zones are displayed on the Zone Representation provided on the front panel with human symbol. Zone with the peak metal is displayed with Bargraph. Sensitivity of each zone can be set separately to get uniform sensitivity at each zone. Microprocessor technology ensure fast and reliable data processing and operation, Metal Detection, Sensitivity setting, Threshold setting, Zone discrimination.UPD-004 detects both ferrous & nonferrous metal concealed on a person.