Kaiqi Circuit Tester 6v / 12v Dc Systems Long Probe Continuity Test Light Car Voltage Kaiqi Quality Assurance.This circuit tester will save you time and speed up the job, perfect for automotive use Circuit Tester for 6V / 12V DC Systems Long Probe Continuity Tester Used to Detect Power, Ground and find Shorts and Breaks in Wires Handle Brightly Illuminates if Circuit is Good Quickly check automotive headlights, taillights, turn signal circuits, faulty sockets, connections, fuses, broken wires and more