Uni-T UT522 Ground TesterUni T UT522 Earth Tester The Uni T UT522 Earth Tester is a practical device for measuring earth resistance and AC earth voltage, designed for use in electrical installations, power systems, and lightning protection systems. The UT522 model offers a resistance measurement range up to 4000 and a voltage range up to 400V, and supports both the simple 2 wire method and the more accurate 3 wire method. Thanks to manual range selection, a clear backlit
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