Ideal for Locating Studs, Objects/Wires Carrying Voltage, Hidden Metal. The lightweight, easy-to-use MSV250 LED 3-in-1 Stud, Voltage & Metal Detector uses 4-level, low power consuming, light-emitting diodes to precisely indicate objects when the unit is moved along a wall, ceiling or floor surface. Hidden metals and wiring can be detected accurately by switching between the metal and voltage selectors. Users can also search for wood studs while operating the metal or voltage detector simultaneously.