Gallagher Neon Tester 5 LightThis portable device can easily fit in your pocket and save you hours of checking fence lines for shorts. Capable of tracking the source of an erratic or poor electric fence in minutes, it is an essential item to have on any farm. There is a large, easy to read light display which shows voltage and current. The fence voltage level has five highly visible neon indicator lights which show how powerful your fence is: Excellent: Greater than 4800V Good: