The Stafix Fence Compass is both a voltmeter and a current reader. It helps you find shorts and faults on your fence. It reads amps (showing severity of a short) and also shows direction of pulse. It has a backlight display and audible current indicator. Its robust design is impact & water resistant. It has a handy belt clip. Has internal 9V battery. This tool will save you a lot of walking looking for faults on your system and we think that everyone with electric fence should own one. We feel so strongly about it that we try to keep the price down.