Auto Circuit Tester Pen 6-24V Voltage Power Probe Tool for Vehicle Electrical System Testing Wide range applications: EM285 circuit tester can be used to test continuity, test polarity of a voltage, check lamp, check electric motor, follow and locate short circuits, test for bad ground contacts etc.<br> Long test lead: The cable length is about 16ft which allows you test any electrical system easily.<br> Short-circuit protection: The unit has short-circuit protection and can test for bad ground contacts instantly.<br> Easy operation: 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.<br> Comprehensive 6-24V DC test kit: Do not use on AC voltage.<br> Operation Instrcutions:<br> Unroll the unit's cable<br> Clamp the red clip to the positive terminal of the vehicle's battery<br> Clamp the black clip to the negative terminal of the vehicle's battery<br> Operation Voltage: 6-24V DC<br> Overload Protection: 8A (When the current exceeds 8A, this item will disconnect the current automatically.)<br> Colour: black + red<br> Material: plastic + metal<br> Package Contents:<br> 1 * Circuit Tester<br> Only the above package content, other products are not included.<br> Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.