... , industrial zones, government buildings, schools, hospitals, etc. hand-held metal detector MD-200 Features:1. Operating frequency:2. Weight: 272g3. Size ... to use, easy to adjust16. Detecting distances: a) 1/2 pin: 10mm b) Model 64 pistol: 150mm c) 6" dagger: 150mm ... h) Lead brick (1g): 30mm High Sensitivity Hand-held Metal Detector MD-200