... used in airports, industrial zones, government buildings, schools, hospitals, etc. hand-held metal detector MD-200 Features:1. Operating frequency:2. Weight ... for 40 hours normally)9. Control: circulation switch (On, Off, a sound of light or mode of vibration)10.Uses cycle ... voltage15. Simple, convenient to use, easy to adjust16. Detecting distances: a) 1/2 pin: 10mm b) Model 64 pistol: 150mm c ...