Feature: 1. The unit is the best electrical tester for reducing diagnostic time in automotive electrical systems. 2. 5m/16.4ft long cable designed makes your testing easily, which is flexible to use. 3. After a simple hook-up of the unit to the vehicle's battery, automotive technician can conduct a positive or negative battery current to the tip by rocking the power switch forward or backward. 4. The unit has short-circuit protection and can test for bad ground contacts instantly. 5. It allows you to track and locate short circuits, which is practical to use. 6. It can also test for continuity with the assistance of its auxiliary ground lead. 7. It is a comprehensive 6-24V DC test kit, features stable and professional performance. Specification: Condition: 100% Brand New Item Type: Car Electric Circuit Tester Material: ABS Color: As picture shown Working Voltage: 6-24V DC Cable Length: Approx. 5m/16.4ft Overload Protection: 8A (when the current exceeds 8A, this item will automatically cut off the current). Applications: 1. Test for continuity 2. Test for polarity of a voltage 3. Check switches, relays and the on-off of diodes, fuses and circuits 4. Test for polarity of electric cables and plugs 5. Track and locate short circuits 6. Test for bad ground contacts Operation Instrcution: Unroll the unit's cable Clamp the red clip to the positive terminal of the vehicle's battery Clamp the black clip to the negative terminal of the vehicle's battery . Package List: 1 x Car Electric Circuit Tester1 x Manual