Check the listing for details. Digital Automotive Car Power Circuit Electrical Tester Probe Test Device System. Condition: New. Listed at 20.69 USD. AERMOTOR Digital Automotive Power Probe Circuit Electrical Tester Device System Features: Wide range applications: AERMOTOR 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 vehicles battery, automotive technician can conduct a positive or negative battery current to the tip by rocking the power switch forward or backward. Comprehensive 6-24V DC test kit: Do not use on AC voltage. Wide range applications: This 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. Operation Instrcutions: Unroll the units cable Clamp the red clip to the positive terminal of the vehicles battery Clamp the black clip to the negative terminal of the vehicles battery Easy operation: After a simple hook-up of the unit to the vehicles battery, automotive technician can conduct a positive or negative battery current to the tip by rocking the power switch forward or backward. Specifications: Operation voltage: 6-24V DC (The tester needs to be connected to the vehicle battery before it can be used.) Overload protection: 7A (When the current exceeds 7A, this item will disconnect the current automatically.) Material Type: plastic and stainless Cable length: 4M / 157.5inch Item Length: 225mm / 8.85inch Item Width: 30mm / 1.18inch Package List: 1 * Circuit Tester