Wall Scanner Metal Detector Electric Metal Wood Studs AC Live Wire Copper Finder Depth Tracker Electric Detection Instrument. This detector can be used to detect wall studs, metal pipes and wires. When it detects wall studs, metal pipes and wires, it will make sound and light to alert you. Ergonomically designed for comfort in use. Finds the edges of wood or metal rivets up to 3/4" (20mm) deep. The perfect home improvement tool.