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A meter calibrated with this method gives correct reading only when resistances R1 and it is advisable to determine resistivity of the type of gravel or crushed rock to be used. If resistance of the sample is R ohm.get price
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Soil Resistivity and Grounding System Testing Sand and Gravel 5,000 100,000 Probe Spacing Meter Reading Calculated Resistivity (Feet) (Ohms) (Ohm-Meter) 5 52.00 497.90 10 19.68 370.87get price
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