This automotive circuit tester is designed to test continuity, test voltage polarity, check light, check motors, track and locate short circuits, test ground contact problems, and more. Features: Wide Application Range: The automotive circuit tester can be used to test continuity, test voltage polarity, check light, check motors, track and locate short circuits, test ground contact problems, and more. Long Testing Cable: With a cable length of approximately 16feet, you can easily test any electrical system. Short Circuit Protections: The unit has short circuit protections, which can instantly detect ground contact problems. Easy to Operate: Simply connect the device to the vehicle's battery, and automotive technicians can conduct positive and negative current conduction by rocking the power switch forward or backward. When the current exceeds 8A, it will automatically disconnect the current. Note: Do not use it under ACVoltage. Specifications: Main color: black Cable length: 16ft Overload protections: 8A Working voltage: 6-24VDC Package size: 265 * 90 * 40mm / 10.4 * 3.5 * 1.6in Package weight: 320g / 11.3ounce Packing List: 1 * Electric Circuit Tester