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Application: 3-Point measurements of resistance to ground of ground rods and grids. 3-Point measurements are used when electrode or grid can be easily disconnected. 4-Point tests or soil resistivity measurements. Locating areas of lowest soil resistivity is essential for achieving an economical grounding installation. Touch and step potential testing measurements. These tests are recommended when the ground cannot be disconnected, where ground faults are highly likely to occur, or when the ?footprint? of grounded equipment (the outline of the part of equipment in contact with earth) is comparable to the size of the ground to be tested. 2- or 4-Wire tests for continuity tests on bonding or on grounding systems. Test is a DC resistive test using 250mA or more and is used to check bonding of all connection points on the ground system. Earth coupling measurement and display. Used to estimate the influence of two earth resistance systems that are not connected to each other."