The Fenceman Tester 6 lights.
Will show if a line is live, it will also show the strength and voltage.

The six lights provide an indication: three or more means the fence is operating as it should, less than three shows there is a problem.

Features:
6 clear levels indicated, from 1000 to 6000 volts
Suitable for netting, polywire, wire or rope
Clearly denotes fence strength