3-48V DC Voltage Tester: 3-48V DC Car circuit tester light, designed for checking various vehicles electrical circuits, such as automotive headlights, taillights, battery, sfaulty sockets, fuse, also for testing other 3-48V DC wiring and circuits.A must have tool no matter for business or household use, will serve you faithfully for years. Accurate Backlight Digital Display: Heavy 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 day and night. test light draws much less current than the incandescent lamp, which is less likely to damage sensitive circuits. Bidirectional Voltage Test Indication: Automotive Circuit Tester is designed with '+' / '-' polarity indicate, and you can attach the alligator clamp either to ground or positive. This will be a good circuit test tool for an car mechanic. Extended PU Spring & Large Alligator Clip: High quality 140 in