1.Multipurpose Tester: Our Car Circuit Tester features a multifunctional integrating design, including load device and bulb load testing, pulse signal and voltage testing, and polarity display. Diagnose short circuits or fuse faults quickly and easily with this diagnostic tool 2.Effortless Electrical Testing: With the Car Circuit Tester, you can easily complete voltage tests using LED digital display or bulb mode, which assesses voltage strength by bulb brightness. It features a computer safe mode, bulb mode, and quick test mode, and is equipped with a 12V 5W test bulb for battery failure/fuse circuit diagnosis 3.Improved Testing Capability: Equipped with a test bulb on the to quickly determine wire power failures, discover invisible poor contacts, and identify virtual voltage faults; this tester can also perform pure voltage testing and bulb load testing, providing more accurate results 4.Improved Testing Accuracy: The Car Circuit Tester simplifies load device testing by displaying power polarity with red and green LEDs. It is equipped with load plugs and two probes, streamlining testing processes while the red light indicates positive poles and green light indicates negative poles