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Method of self electrical potential (along and the gradient) SP.Method of induced polarization and short-term induced polarization IP (chargebility).Those apparatuses can be used in the following electro resistivity methods of direct current: The maximum depth of study using the equipment is around 160 meters ( or 524 feet), and can be increased to 240 meters ( 787 feet) in case of long line.
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As we all are aware of the success of those methods in discovering cavities and water levels in layers. Those universal apparatuses have been developed for implementation in engineering and applied geophysics in studies of electrical properties of geological data.