Wide range applications: EM285 circuit tester can be used to test continuity, test polarity of a voltage, check lamps, check electric motors, follow and locate short circuits, and test for bad ground contacts. Long test lead: The cable length is approximately 16 feet, allowing easy testing of various electrical systems. Short-circuit protection: The unit includes short-circuit protection and can instantly test for faulty ground connections. Easy operation: After connecting the unit to the vehicle's battery, an automotive technician can apply positive or negative battery current to the tip by toggling the power switch forward or backward. Comprehensive 6-24V DC test kit: For use with DC voltage only. Do not use on AC voltage. Operation Instructions: Unroll the unit's cable. Attach the red clip to the positive terminal of the vehicle's battery. Attach the black clip to the negative terminal of the vehicle's battery. Operating Voltage: 6-24V DC Overload Protection: 8A (The unit automatically disconnects current when the limit is exceeded.) Color: Black and red Material: Plastic and metal Package Contents: 1 x Circuit Tester Note: The package includes only the items listed above. Other products are not included. Note: Lighting and display settings may cause slight variations between the color of the item in the image and the actual product. Measurement may vary by +/- 1-3 cm.