There are different types of earth testers manufactured by different companies. These earth testers are basically used to test the resistance of the grounding rods. The grounding rods are placed in the ground somewhere outside the homes to protect the wiring system of the house from any electrical shocks. The electrical surges, if any are directed to the ground through these grounding rods. There are the chances of the grounding rods getting corroded and becoming less effective. For this reason, the earth testers are used to make occasional checks that the grounding rods are still working properly.

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