Features1. Wide application range: The circuit tester can be used to test conductivity, test voltage polarity, inspect lights, inspect motors, track and locate short circuits, test poor grounding contacts, etc.2. Long test line: The cable length is approximately 16 feet, allowing you to easily test any electrical system.Short circuit protection: The unit has a short circuit protection function, which can immediately detect poor grounding contact.3. Easy to operate: After simply connecting the device to the vehicle's battery, automotive technicians can conduct the positive and negative currents of the battery to the tip by shaking the power switch forward or backward.4. Comprehensive 6-24V DC test kit: Do not use under AC voltage.Operating instructions:Unfold the cables of the local machineClip the red clip onto the positive pole of the vehicle batteryClamp the black clip onto the negative pole of the vehicle batterySpecifications:Color: RedWorking voltage: 6-24V DCCable length: 16ftOverload protection: 8a (when the current exceeds 8a), this item will automatically disconnect the currentPackaging size: 26.5 x 9 x 4cmPackaging weight: 320gPacking list:1x Circuit Tester