SG Tool Aid 27300 HD Circuit Tester with 12′ Retractable Wire & Battery Clip

Features an extra long wire that stretches up to 12 feet for use, then automatically retracts. Great for use on cars, trucks, boats, trails, motorcycles, airplanes and snowmobiles. A heavy duty ground clip with insulator is on one end of the retractable wire and a spring supported strain relief is on the other. For 6 and 12 volt vehicles.