door frame metal detector Detecting dangerous articles in human body Perfect weather-proofing design for outdoor Model No.: AT-300B 1. rfect ... gun, and copper, aluminums, zinc (more than 150g), ignoring metal in belt button, shoes. 4. Shock proof to avoid false ... ; ISO 9001:2000 Certificate, National standard Function: Walkthrough Metal Detector can easily detect weapons, such as knife and gun ...