Possbay Auto Truck Car Electric Circuit Voltage Tester DC 6V 12V 24V Test Light Pen Tool For use on cars, trucks, boats, trailers, vans, RV's and motorcycles Used for locating short circuits, faulty head or tail lights or bad fuses Wire stretches to 4-feet for use then automatically retracts DC 6-24 voltage test light with Insulated clip and insulated clear handle Perfect for car fault self-checking and repair