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Digital Voltmeter – RL20
Highly accurate and compact digital voltmeter, built with solid state circuitry for extra durability and reliability. Simply insert the earth probe into the ground then attach the crocodile clip to the fence.
There is an automatic on/off switch and it reads from 100-10,000 volts. The tester is powered by a 9 volt battery with a life of 12-18 months.