This ICON™ Professional Digital Display Circuit Light Tester with Interchangeable Shanks is great for working on 6/12/24V systems. The <10 mA circuit draw* is computer and circuit safe, so you can test vehicles confidently. The 3 to 49V DC detection range is great for testing a variety of vehicles. Test circuit integrity and accurately detect if the source is power or ground. The surge and over-voltage protection is great for stress-free probe operation. The cord on this circuit light tester extends up to 12 ft. to reach most circuits. A universal adapter is included for testing a variety of wire connections.