Features:        EM285 Automotive Electric Circuit Tester Car Electrical System Tester 6-24V DC.     This power probe can text the voltage polarity, check switches, relays and the on-off of diodes, fuses and circuits, track and locate short circuits.     This power probe comes with long cable, which allows you test any electrical system easily.     This power probe is highly sensitive and has short-circuit protection and can test for bad ground contacts instantly.     This power probe is easy to use, no any complicated process, convenient and practical.     This power probe can test polarity of electric cables and plug, suitable for truck, car manufacturing.     Short-circuit protection: The unit has short-circuit protection and can test for bad ground contacts instantly     Comprehensive 6-24V DC test kit: Do not use on AC voltage        Specifications:        Item type: power probe     Material: plastic     Color: black+ red     Cable length: 4m     Operation voltage: 6-24V DC     Overload protection: 7A (When the current exceeds 7A, this item will disconnect the current automatically.)        Functions:        Test for continuity     Test for polarity of a voltage     Check switches,relays and the on-off of diodesfuses and circuits     Test for polarity of electric cables and plugs     Track and locate short circuits     Test for bad ground contacts        EM285 Operation Instrcution:        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     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 battery        Package included:        1 x Power probe     1 x Package box     1x Manual