... 0 to99 High: Can detect a clip Low: Detect big metal articles such as: knife, gun, and copper, aluminums, zinc (more ... ), ignoring metal in belt button, shoes. 4. Shock proof to avoid false alarm 5. Sound and light alarm 6. Intelligent traffic and ... Certificate; ISO 9001:2000 Certificate 3. National standard Function: Walkthrough Metal Detector can easily detect weapons, such as knife and gun, and ...