The Vevor automotive circuit tester is designed for quick and efficient diagnosis of vehicle electrical systems. It supports testing for DC voltage, AC voltage, frequency, duty cycle, fuel injection, resistance, and diode functions in one compact tool. A 1.77" TFT color display provides real-time waveform and numeric readings for easier troubleshooting. The 19.7' cable and built-in flashlight help improve reach and visibility during use. Its portable design makes it convenient for automotive testing at home, in the shop, or on the go.