The Powerflex Energy Probe 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 is impact & water resistant. It has a handy belt clip, but it is also the perfect size to fit in your shirt pocket. Internal 9V battery is included. 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.