OTC 3636 Heavy-Duty Coil Cord Circuit Tester Designed for testing electrical circuits and locating shorts grounds and open circuits Features include 12 foot heavy-duty coiled cord and checks both 6 and 12 volt systems Ergonomic slim designed clear handle with a bright red slim style replaceable bulb Positive contact-molded strain relief High current clips with protective boots open to an extra wide 5/8 inch for ease of hook-up