... . MD-S1 (HIGH PERFORMANCE HAND HELD METAL DETECTOR)FEATUREVery High SensitivityDetection of both Magnetic and Non-Magnetic MetalsOptical, Acoustical and Vibration Alarm Long Battery LifeVery High Reliability Easy ... factory, electronic factory, gold, silver or jewelry manufactory storehouse etc.Quality inspection: medicine, food etc.Package inspection: post office, express company ...