• 3-48V automotive circuit tester with voltmeter and backlit LED display • Accurate voltage reading via digital LED display • Bidirectional current and voltage testing: the red light shows the positive pole and the green light the negative pole • Pure copper terminals and insulating protective cover for greater safety and durability • Insulation protection to prevent electric shocks and burn-resistant circuit protection function • Easy to use: connect the alligator clips to ground and use the sharp steel probes to check circuits, find broken wires, and check fuses and current • Wide application: detects current, ground, short circuits, and wire breaks, checks headlights, taillights, turn signals, sockets, connectors, and faulty wires