Wide range of 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 connections. Long test lead: Cable length is approximately 16 feet, allowing for easy testing of various electrical systems. Short-circuit protection: Built-in protection feature that quickly detects and responds to short circuits and poor ground contacts. Easy operation: Simply connect the unit to the vehicle's battery; by toggling the switch, technicians can apply positive or negative battery current to the probe tip. Comprehensive 6-24V DC test kit: Designed for use with 6-24V DC systems only. Do not use on AC voltage. Operation Instructions: 1. Unroll the unit's cable. 2. Connect the red clamp to the positive terminal of the vehicle's battery. 3. 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: The package includes only the items listed above. Other items are not included. Lighting and display settings may cause slight color variations between the product image and actual item. Measurement error allowance is +/- 1-3 cm.