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AVO stands for Amps, Volts, and Ohms. AVO is famous for its popular AVOmeter multimeter tool. This line of test equipment measures direct current (DC), direct voltage, and resistance. Often, consumers refer to this brand’s multimeter as simply an “AVO.” AVO also created high potential (hipot) testing tools and high-sensitivity meters. In the 1960s, AVO merged with Megger Group Limited when both companies moved from London to a manufacturing site in Dover, England. Today, AVO lives on as Megger’s training institute for test equipment professionals. Purchase a used and professionally refurbished AVO ground resistance tester, model DET62D, from ValueTronics.com.