The Vevor automotive circuit tester is designed to quickly identify faults in vehicle electrical systems. It supports multiple diagnostic functions including polarity, continuity, signal circuit testing, component activation, poor ground detection, and short circuit tracking. A 1.77" TFT color screen provides real-time readings and waveform changes for easier analysis. The tester features a phosphor bronze probe, overload protection, a built-in flashlight, and a durable ABS shell. Its 13' cable gives you extended reach for testing circuits throughout the vehicle.