With The K7101 Mains Voltage Detector SELF-ASSEMBLY electronic kit wires can be very easily checked for mains voltage. It can be used to search for wires installed in or behind walls or to trace interruptions in wiring.
A flashing LED indicates whether or not voltage is present. The flashing speed indicates how close by the wire is. If an audible signal is also desired, space has been provided on the PCB for buzzerSV4/12-S to be connected.Specifications