A simple tool for testing whether there is sufficient power on the fence. Five highly visible neon indicator lights show approximate voltage readings. Ideally you will see 3 or more lights; if not the fence system should be checked. 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. The indicator comes with a handy pocket clip for convenience around the farm! Warranty: 1 year