My DIY Passive Mini Radio/Microwave Detector — Steemit
Super cheap $2 Cable Tracer circuit - Gadgetronicx
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
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
Minimal metal detector made with an Arduino and a coil of wire | Arduino Blog