... Handheld Metal Detector MD-3003B1 1) High quality 2) 409g each net weight 3) Present 1pc 9V ... choose sound alarming or cancel vibration function, earphone isoptional.2. With high sensitivity, can detect Ferrous and non- ... detention centers, public organs, courts, stadiums, exhibition venues, entertainmentsites, station terminals.-Mining, electronics, hardware, jewelry, coinage etc. precious metals ...