This Automotive Short and Open Finder, car repair tool is designed to identify and trace wires or cables without damaging the insulation. You can also use it in checking for short circuit and locating open circuit and so on. Included in the set are Sender and a Receiver with a flexible thus, tracing wires made possible even inside bundles, conduits, behind panels, under carpets, upholstery, etc. Easy to use by just simply connect the transmitter in series with the circuit or wire under test, (i.e.: in place of a blown fuse, across a connector, in series with an open wire, a light bulb socket, etc.), and scanning the circuit/wire with the tracers flexible probe to find the trouble spot.