I have a pair of Lydite Fence (L-Fence) electrical fence testers. They are new but have been opened. Pair of fence testers and a belt sheath included. Testers are normally blank when not in use. When they sense current will briefly display "On" on the screen and then proceed to read fence voltage. Screen will return to blank a few seconds after removal from voltage. I have more than one set, if you are interested.
Thanks for looking,
Mark