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.Long test lead: The cable length is about 16ft which allows you test any electrical system easily.Short-circuit protection: The unit has short-circuit protection and can test for bad ground contacts instantly.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 switch forward or backward.Comprehensive 6-24V DC test kit: Do not use on AC voltage.Operation Instrcutions:Unroll the unit's cableClamp the red to the positive terminal of the vehicle's batteryClamp the black to the negative terminal of the vehicle's batteryOperation Voltage: 6-24V DCOverload Protection: 8A (When the current exceeds 8A, this item will disconnect the current automatically.)Colour: black + redMaterial: plastic + metalPackage Contents:1 * Circuit TesterOnly the above package content, other products are not included.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.