Automotive Circuit Tester 6 to 42V DC Flexible Probe Portable Circuit Fault Finder for Vehicle Item Type: Automotive Circuit TesterMaterial: ABSVoltage: 6-42V DC Power Supply: 2 9V batteries (not included in the package)Function: Tracing of wires is made possible even inside bundles, co nduits, behind panels, under carpets, upholstery, etc Easy e: 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 42 V Ready: for use in the new generation of vehicles with mixed or single 42 Volt systems Operates on DC voltages from 6 to 42 volts Internally protected against power surges and overloads 7in flexible probe allows reaching wires in congested places Transmitter and receiver LEDs show open or short circuit Conditions: Adjustable sensitivity for all tracing situations No wire piercing required, non contact technology! Hpw e The Probe? The probe of the receiver is built of coiled steel and may be bent as needed, in order to reach wires in ongested or difficult areas. Depending on the circuit characteristic and sensitivity settings,the probe will pick up the signal from the wire in a range of positions. However, for the best possible range the Receiver's probe tip (black cap) should be positioned perpendicular (at 90°) to the wire being traced and either above or below it.