A wired 6 - 24 V voltage tester that can be used to efficiently and reliably check the current flow in cars and other devices. The voltage tester is suitable for checking bulbs, batteries, cables and fuses, among other things.

Ground the jaws of the pen, e.g. to the body of a car, and touch the tip of the pen to the object to be measured like a probe pen. If there is voltage at the point being tested, the light on the pen will turn on.