Check the listing for details. Test Light Car Circuit Tester Probe 6V 12V 24V Voltage Continuity Tester. Condition: New. Listed at 4.99 USD. Car Voltage Circuit Tester Voltage Range: 6V / 12V DC Bulb: 3W Bulb (Replaceable) Package Included: 1 x Circuit Tester Product Description: 1. Circuit Tester for 6V / 12V DC Systems Long Probe Continuity Tester. 2. It can be used to detect power, ground and find shorts and breaks in wires. 3. Just unscrew the test pencil top metal cap to replace the light tube and time-saving. 4. Handle Brightly Illuminates if Circuit is Good. 5. Quickly check automotive headlights, taillights, turn signal circuits, faulty sockets, connections, fuses, broken wires and more. 6. It will save you time and speed up the job, ideal for automotive use. 7. Portable-small size, compact structure, equipped with rack, convenient to carry and use