Draper 6-42V Circuit Tracer And Detector | EtctThis circuit tracer is designed to quickly and easily detect short and open circuits without damaging the wire insulation. It features a sensitivity controller and a flexible probe, ideal for use in restricted areas. This device is suitable for automotive fault finding and repairs involving direct current. It operates on two 9V batteries (sold separately) and includes a battery indicator that signals when it is time to replace the batteries.