Monitor the voltage of your electric fencing and trace fence-line shorts and faults with Gallagher's Digital Volt Meter. It's pocket-sized and water reistant, so you can bring it with you just about anywhere. It has a lifespan of 6 to 12 months with a single 9-volt battery, and it reads the voltage for battery-powered energizers even when the energizers are running in battery-saving mode. | Gallagher Digital Volt Meter