Wide testing range & Voltage Polarity Testing3-48v low DC volt circuit test light, designed for checking various vehicles electrical circuits, such as automotive headlights, taillights, faulty sockets, fuse, also for testing other 3-48V DC wiringand circuits. This is also a bidirectional voltage tester with volt polarity indicating, you can attach the alligator clamp either to ground or positive. A must have tool no matter for business or household use, will serve you faithfully for years. Computer Safe & Backlight Digital Display PartHeavy Duty circuit light tester with highly clear LCD digital blue backlight display screen, resolution to .1V voltage reading with high accuracy to 0.2V, clear&visible digital readouts for dayand night. test light draws much less current than the incandescent lamp, which is less likely to damage sensitive circuits. Quality Made Tester BodyProfessional automotive circuit tester with premium acetate fiber body, allows for more toughness and durability. Sharp stainless steel probe for piercing wires effortlessly, also for hard to reach tight areas. Along with insulationprotective rubber tip to against electric shock. Extended PU Spring & Large Alligator ClipHigh quality 140 inch long enough PU spring wire offers more flexibility, lighter and more durable than normal cable wires, heat-insulation and oil resistance for daily use. Attach with large size alligator clip for easy one hand operation, also for convenient use and storage.