I have one that is tricky to locate faults with. Depending on the type of damage to the wire, you can spend all day looking for that bubble in the insulation on a wire that was damaged by lightning, dig it up & repair it, go on down the line and find another spot at the next twist or turn in the wire....... Better to unload the old Burkeen B30 and put in another. The pulser does have some uses though. I think I paid $750 for mine ten years ago.