Simple tool for testing whether there is sufficient power on the fence. Manufactured from tough and durable A.B.S. plastic. Simple to read and simple to use the Fence Volt Indicator allows you to quickly test the fence line whenever you need to. Unlike most other fence tester, the Gallagher Neon Tester doesn't require any batteries. So it will work whenever you need it due to being powered by the electric fence line. Simply push the probe into the ground and at the same time, hold the body of the tester against your fence wire, tape, rope etc. and check how many lights are flashing (in time with the pulses from your Energizer). light = 1.0 kV - 1.8 kV lights = 1.9 kV - 2.5 kV lights = 2.6 kv - 3.8 kV lights = 3.9 kV - 4.8 kV lights = 4.9 kV or more Ideally you will see 3 or more lights; if not the fence system should be checked.