1This comprehensive 6-24V DC test kit is the best electrical tester to reduce the diagnostic time of automotive electrical systems. 2With shortcircuit protection and can test for bad ground contacts instantly; Overload protection, when the current exceeds 8A, it will automatically cut off the current. 3After simply connecting to the vehicle's battery, the car technician can conduct the positive and negative battery current to the tip by shaking the power switch forward or backward. 4About 4 meters long cable, its long cable makes it easy for you to test. And the probe is a detachable design, which is convenient for safe storage when not in use. 5Allows you to track and locate short circuits, and you can also test continuity with the aid of an auxiliary ground wire. Item Type: Circuit Tester Material: Plastic + Metal Operation Voltage: 6-24V DC Cable Length: Approx. 4m/4.4yd Overload Protection: 8A (When the current exceeds 8A, this item will disconnect the current automatically.) Applications: 1. Test for continuity 2. Test for polarity of a voltage 3. Check switches, relays and the on-off of diodes, fuses and circuits4. Test for polarity of electric cables and plugs 5. Track and locate short circuits 6. Test for bad ground contacts Operation Instruction: 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 batteryTips: 1. An alarm sound made by the item indicates that the circuit breaker trips off. 2. After the circuit breaker trips, it will reset automatically within 3 to 5 seconds. 3. After an alarm sound, if this item is still connected with the testing object and you keep pressing down the power switch, the circuit breaker will repeat the process of trip and reset automatically. Do's and Don'ts: 1. Do not use the item around explosive gas, vapor, or dust. When the power switch is pressed (or rocked), battery current is conducted directly to the tip which may cause sparks when contacting ground or certain 2. The unit is not to be used with 110/220V house current, it is only use for DC 6~24V systems. 3. Do not use on AC voltage. 4. After you finishing checking vehicle, correctly restored all the connection-s which you disconnected. 5. Always follow the instructions and procedures indicated in the vehicle's service manual before attempting to disconnect any part or subsystem of the electrical circuit. 6. Never touch any dangerous part of the vehicle with your hand for safety. Don't touch any live conductor with hand or skin. 7. Don't use it if it is damaged. 8. Some components of vehicle work on low voltage, they cannot withstand the voltage allied by the item. To avoid damage for these components, don't use the item to apply voltage directly or indirectly. 9. Before driving, please always make sure that the vehicle is safe and reliable. 10. Don't use this item when driving. 1 xCircuit Tester 1 x Manual