Wide range applications: The EM285 circuit tester can be used to test continuity, polarity of voltage, check lamps, electric motors, locate short circuits, and test for faulty 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 enables quick detection of poor ground connections. Easy operation: After connecting the unit to the vehicle's battery, users can apply positive or negative battery current to the probe tip by toggling the power switch. Comprehensive 6-24V DC test kit: Designed for use with DC voltage only. Do not use on AC circuits. Operation Instructions: 1. Unroll the unit's cable. 2. Attach the red clip to the positive terminal of the vehicle's battery. 3. Attach the black clip to the negative terminal of the vehicle's battery. Operating Voltage: 6-24V DC Overload Protection: 8A (The unit will automatically disconnect if current exceeds 8A.) Color: Black and red Material: Plastic and metal Package Contents: 1 x Circuit Tester Note: The package includes only the items listed above. Other accessories shown 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.