DurableEquipped with pure copper clip and insulation protective cover, which can better grip the body and screws, this voltage digital circuit tester provides with insulation protection against electric shock. Application5-32V Widely Use Circuit Tester,multifunctional household test pen, you can use it to test circuitlocating shorts grounds and open circuits and distinguish whether an object is electrified. For use on cars, boats, trailers, RV's, motorcycles, airplanes and snowmobiles. Widely UseThis Professional automotive heavy duty circuit tester pen designed to test 5-32V DC voltage, ideal for checking vehicles voltage values, positive and negative electrodes, electrical circuits and wiring, used in maintaining automobile battery, ship battery, etc. StretchableWith 140cm Spring Mini-Coil Cord, made with stainless steel probe for piercing wires, for hard to reach areas.ideal for checking vehicles voltage values, positive and negative electrodes, electrical circuits and wiring Digital DisplayClear screen display for accurate volt readouts.Circuits board with micro current than traditional test lights, more secure to automotive computer board.