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Have you noticed a thick wire which comes out from the electric mains box and makes its way into the earth? Well, that is known as the earth wire. In the event of lightning strike or voltage fluctuations, excess current flows into the earth, thus saving your electrical appliances and fittings from getting damaged. To ensure that the connection to the ground is safe and reliable, electricians carry out a test with the help of digital earth resistance testers. Applications of Earth Resistance Testers The earth’s resistivity is not only measured when your mains connection is installed but also, it is used for locating ore sources, clays and gravel beneath the earth’s surface. The measurement is also done to determine the distance to the bedrock and the thickness of glacial drift. Earth resistance testers are also used to calculate the degree of corrosion in underground pipelines carrying water, oil and gas. Ground Resistance Meters Like earth resistance testers, ground resis...