This tester shows the fence voltage on 5 levels from 1000v to 5000v.

Just place the top of the tester against the fenceline and the prong to the ground and watch the lights on the display light up to show the strength of power going through the fence.

This is very handy piece of kit that is worth it's weight in gold when your unsure of your fences efficiency. Particularly handy for fences that have several joins and you need to test that the electricity is conducting through each line with no loss of power.