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Fluke 1625-2 Information The Fluke 1625-2 GEO Earth Ground Tester is a versatile and powerful tool for measuring earth ground loop resistances. It can perform all four types of earth ground measurement: 3- and 4-Pole Fall-of-Potential (using stakes), 4-Pole Soil Resistivity testing (using stakes), Selective testing (using 1 clamp and stakes), and Stakeless testing (using 2 clamps only). The 1625-2 features Automatic Frequency Control (AFC) to identify existing interference and choose a measurement frequency to minimize its effect, providing more accurate earth ground value. It also calculates R* measurement, which calculates earth ground impedance at 55 Hz to more accurately reflect the earth ground resistance that a fault-to earth ground would see. The 1625-2 is IP56 rated for outdoor use and comes in a rugged carrying case. It includes two test leads, two current clamps, four stakes, a USB cable, and a carrying case.