Long Probe & Alligator Clip: The long probe with an alligator clip allows you to reach the right spot. The tester's sharp steel probe can easily penetrate wire insulation. ⇊Wide Application: It can be used for cars, RVs, and even trucks. A professional tool for detecting open circuits, fuses, adjusting signal lights, headlights, taillights, etc. ⇊LED Working Indicator: When the circuit connection is complete, the indicator light on the handle will illuminate to indicate that the power is on. And the brightness of the light will vary with different measured voltages. ⇊Bidirectional Voltage Tester: This upgraded circuit test light is a bidirectional voltage tester. Under positive connection, the red LED will light up, and under negative connection, the green LED will light up. ⇊Don't worry about losing it: The integrated structure of the probe's protective cover makes this automotive fuse tester not easy to lose. And it is lightweight and compact, convenient to carry and take with you wherever you go.