This professional automotive circuit tester works with (-110) to (+110) VDC systems. It supports testing for polarity, current, resistance, frequency, continuity, duty cycle, injector, and diode. The TFT color display clearly shows voltage data and a waveform graph. Ideal for diagnosing circuits in cars, trucks, motorcycles, tractors, boats, and household appliances. | Vevor | | Automotive Circuit Tester, 8 | 35 DCV Power Circuit Probe Tester with TFT Color Display and Lighting | Black;Orange | Best Buy