OTC Heavy-Duty Coil Cord Circuit Tester is designed for testing electrical circuits and locating shorts, grounds, and open circuits. The features include a 12 foot heavy-duty coiled cord. It checks 6 and 12 volt systems. It has an ergonomic, slim-designed, clear handle. It has a bright red, slim style replaceable bulb. It has a heavy-duty stainless steel probe with insulated shaft and heavy-duty clip with positive soldered connection.