Wide range of applications: The EM285 circuit tester can be used to test continuity, polarity of voltage, check lamps, electric motors, trace and locate short circuits, and test for faulty ground connections. Long test lead: 16 ft cable length allows easy testing of various electrical systems. Short-circuit protection: Built-in protection feature enables instant detection of poor ground contacts. Easy operation: Simply connect the unit to the vehicle's battery; technicians can direct positive or negative battery current to the probe tip by toggling the switch forward or backward. Comprehensive 6-24V DC test kit: For use only with 6-24V DC systems. Do not use on AC voltage. Operation instructions: - Unroll the unit's cable - Connect the red clamp to the positive terminal of the vehicle's battery - Connect the black clamp to the negative terminal of the vehicle's battery Operating voltage: 6-24V DC Overload protection: 8A (automatically disconnects when current exceeds 8A) Color: Black and red Material: Plastic and metal Package contents: 1 x Circuit Tester Note: Other items not included. Note: Lighting and display differences may cause slight color variation between the image and actual item. Measurement error allowance: +/- 1-3 cm.