[Wide testing range & Voltage Polarity Testing] 3-48v 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 wiring and 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 Part] Heavy Duty circuit light tester with highly clear LCD digital backlight display screen, resolution to.1V voltage reading with high accuracy to ±0.2V, clear & visible digital readouts for day and night. test light draws much less current than the incandescent lamp, which is less likely to damage sensitive circuits. [Quality Made Tester Body] Professional automotive circuit tester with premium acetate fiber body, allows for more toughness and durabil