Handheld Metal Detector MD-3003 Handheld Metal Detector MD-3003 FEATURES1. Adopt sound alarming function, earphone is optional. ... more than 40 hourscontinuously.4. Clear and crisp sound, when voltage is not enough, no light or no alarm.5. Have ... inspection equipment to increase safe efficiency, such as walkthrough metal detector.6. Can detect various metals, such as: Copper, Ferrous and ...