- Unique anti-lost needle guard protection: integrated probe protection cover with a needle guard to prevent stab injuries and ensure the guard is never misplaced. Compact and portable for convenient carry. - LED indication and bidirectional voltage testing: bidirectional circuit tester works with the alligator clamp connected to either negative or positive ground. Built-in LED polarity indicator shows red for positive and green for negative polarity. - Buzzer alert and over-voltage warning: during testing the LED lights up and a buzzer sounds. If voltage exceeds 60V, the display shows OL with red and green LEDs flashing; stop the test immediately. - Computer-safe, sturdy and flexible design: features a built-in circuit board chip that is more durable than traditional test lights and helps protect the vehicle computer board from damage. The spring wire extends up to 102 inches for a wide measuring range, with an anti-bending tail wire to reduce wear and breakage. - Wider voltage range and versatile testing: measures up to 60V DC, exceeding common 48V limit on many testers. Ideal for checking various vehicle electrical circuits, including headlights, taillights, turn signals, faulty sockets, fuse connections, and other 4-60V DC wirings and circuits. - Practical use scenarios: - Quick diagnostics of automotive lighting circuits during maintenance or troubleshooting. - Verifying wiring, sockets, and fuse connections in cars, motorcycles, or ATVs. - Testing 4-60V DC wiring and circuits in various vehicles and electrical systems.