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| The best way I've been able to determine "turn back" ability of a fence is to measure voltage betwen the hot wire and ground. I've found on my fences that anything under 2000 volts is iffy on cattle, worthless on sheep. Under 1000 volts can light up a fence checker like a christmas tree, but I can touch it without any serious pain. 3000 volts an above will consistently turn back cattle, and drop you to your knees in a hurry.
Generally I check voltage between the hot wire and a grounded wire, or metal line post. If you are questioning the output of the fence, unhook the fence and put the tester right on the fencer. The two fencers I'm using now can check out at anywhere between 6000 and 7500 volts on the fencer.
Those light-up fence checkers aren't worth carrying. I use an old version of this, and it flat works....
http://www.premier1supplies.com/detail.php?prod_id=387&cat_id=44
This is the fencer we're using on a fence that is tough to maintain due to grass, brush, etc. It has consistently held cows away from weaned calves and gives enough power to turn them away even when the ground is dry.
http://www.premier1supplies.com/detail.php?prod_id=393&cat_id=54
Fenceman is also right, Joules tell me more about a fencers ability to put out "pain" than anything else.
Dave
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Electric fencer ratings
