This pocket size fence tester is an easy and affordable way of testing the strength of your fence and finding faults along the fence line. Each light on the tester represents 1000 volts. Five illuminated lights indicate high voltage. The tester is built into a strong protective case and has a built in earth probe. Easy operational process makes it simple to use. Place earth probe in ground away from fence wire. Touch fence probe to fence wire. Information beside lights gives guide to fence condition.