WIDE TESTING RANGE & VOLTAGE POLARITY TESTING3-72v low volt circuit test light, designed for checking various vehicles electrical circuits, such as automotive headlights, taillights, faulty sockets, fuse, also for other 3-72V DC wiring and circuits. This is also a bidirectional voltage tester with 2 color LED lights for volt polarity indicating, you can attach the alligator clamp either to ground or positive. This is really A must have tool no matter for business or household use. 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 day and night. test light draws much less current than the incandescent lamp, which is less likely to damage sensitive circuits. ANTI-LOST PROBE PROTECTIVE TIP & QUALITY MADE TESTER BODYSharp stainless steel probe for piercing wires effortlessly, also for hard to reach tight