The Laserliner ActiveFinder is a contactless, handy voltage tester for working safely on electrical lines. It locates electrical voltages in cables, sockets, bulb sockets and fuses. In addition it determines the polarity of L/N conductors (e.g. on sockets or terminals) and finds breaks in wires and cables. The ActiveFinder has extremely high sensitivity for tracing lines at great depths. Its zoom function offers tracing of live cables at depths up to 4cm, depending on the material. It features an LED for signalling electrical voltages, and an integrated flashlight with separate on/off button. Its rugged casing is impact-resistant. Supplied with 2 x AAA batteries. Voltage range: 24-1,000 volt. Frequency range: 50-60Hz. Overvoltage Category: CAT III – 1,000 volt (non condensing).