Power up components. 20' jumper lead set. Bad ground indicator. Continuity tester. Short circuit tester Also includes relay and component tester. When you connect your Power Probe to the car battery you will have a multitude of testers at your fingertips. With the press of a switch you'll have an instant hot lead or ground lead. Use the probe tip and ground lead simultaneously to power up components right in your hand. Instantly check components for continuity as well as identify positive, negative and open circuits without re-polarizing hook up clips. Locate shorts without wasting fuses.