3-72V WIDER TESTING RANGE premium automotive test light is upgraded to 3-72V voltage testing range, wider than most test lights on the market. This auto circuit tester ideal for checking various vehicles electrical circuits, such as car headlights, Taillights, fuses, car batteries, etc. It can also be used to measure other 3-72V DC circuit systems. LED DIGITAL DISPLAY & AUXILIARY LIGHTING Heavy Duty auto circuit light tester with LED digital display, voltage reading resolution to.1V with high accuracy to ±0.2V, clear & visible digital readouts for day and night. When measuring, there are two lighting LED beads will illuminate the measured circuit area, making night work more convenient than ever. BIDIRECTIONAL VOLTAGE TESTING & COMPUTER SAFE This is a bidirectional voltage tester with 2 color LED lights and a buzzer for volt polarity indicating, attach the clamp either to ground or positive, the red light will be on for positive and the buzzer sounds once; the green light will be on fo