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Testboy TV 440N Earth Resistance Meter Testboy Testboy TV 440N P The Testboy TV 440N is a Earth Resistance Meter that is suitable for checking the resistance between the reference earth and the connection point of the earthing system For measurement purposes an alternating current is fed between the earth strip and the earth electrode to be measured The voltage drop is measured and the earth resistance is determined with a probe positioned in the area of the reference earth of the earth e
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