Amazon.com : DIY-JEK Stud Finder Wall Scanner, Upgraded 6 in 1 Electronic Stud Detector Sensor with LCD Display & Audio Alarm for Wood Metal AC Live Wire Detection, Joist Pipe, Copper Tube
Find Concealed Metal Pipes, Nails, Studs using this Circuit
Diy Metal Detector | Hackaday
Simple Broken Wire Detector
JS-60 DIY Kit Metal Detector Kit Electronic Kit DC 3V-5V 60mm Non-contact Sensor Board Module DIY Electronic Part Metal Detector
Build your own Live Wire Detector for Contactless AC Voltage Detection