The resulting circuit measures voltage ... but at least it is a fairly uncomplicated way to measuring things. Electric fences do work best with a voltage on them, after all.
He built an electric fence to keep these pests at bay ... The wires are connected to a nine-volt battery. No boost circuit, no transistors, just nine volts across two wires.
OSU Extension educator Dean Kreager explains fencing issues that can arise during a drought and how to mitigate them.