Long Steel Probe: The long, sharp steel probe with alligator clip can easily reach into tight spaces and also drill through insulation, keeping your hands safe while you test connections Built-in indicator light: This circuit tester also includes a built-in indicator light. The light illuminates to let you know when a circuit is live and good to use. Light will not turn on if a circuit is broken Ergonomic design: The handle is made of plastic and the hardened carbon steel probe is chrome plated. The slim and ergonomic design of this tester ensures you have a comfortable and tight grip when using Convenient Use: This circuit tester features an extra-long line that provides great flexibility and freedom so you can move around comfortably when testing circuits outside the home or for large vehicles like trucks Multi-Applications - Can be used in a variety of applications. Mechanics, electricians and homeowners will find great use with this tester. Test for broken or live wires, fuses and circuits. For reaching light sockets, taillights, faulty sockets, distributors, generators, car batteries, headlights, turn signal circuits, motorcycles, SUVs, switches, and sockets