Accurate LED Digital Display:The circuit tester of the probe set is equipped with a LED digital voltage display,which can accurately read the voltage.Measuring range:DC 3-48V. Bidirectional Current and Voltage Test Mode:You can connect the alligator clip to the negative or positive ground,the red light indicates the positive pole and the green light indicates the negative pole.Accurate readings at both during the day and in dark areas. Safe and Durable: Equipped with pure copper terminals and an insulating protective cover, which can better tighten the housing and screws, this high-performance automotive circuit tester provides insulation protection to prevent electric shock. The board has a circuit protection function, which is safer and more resistant to burns. Easy to Use: Connect the alligator clips to ground and then use the probes to test the circuit.Sharp steel probes easily penetrate insulation to check circuits,find broken wires and current,check fuses,light heads and current,quickly and easily to find. Wide Application:Can be used to detect current and ground and find shorts and interruptions in wires.Quickly check car headlights,taillights,circuits of