General MSV100 Stud/Voltage/Metal Detector, 9 V Battery, 1-1/2 in Detection, Detectable Material: Copper/Iron/Wood

The MSV100 can locate wood studs/joists and metal cables/pipes behind walls or even inside furniture. It can also make the work of contractors, carpenters, plumbers, electricians and demolition crews safer by detecting energized AC outlets and live wires behind walls or ceilings.