... 0 to99 High: Can detect a clip Low: Detect big metal articles such as: knife, gun, and copper, aluminums, zinc (more ... than 150g), ignoring metal in belt button, shoes. 4. Shock proof to avoid false ... Certificate; ISO 9001:2000 Certificate 3. National standard Function: Walkthrough Metal Detector can easily detect weapons, such as knife and gun, and ...