JD-3 Soft-electrode probe The spacing of the four electrodes is up to you Measuring parameters: SP, NR, LR and IP Measuring range: 0 to 10KΩm Measurement sensitivity: 0.04Ωm Scale accuracy error: <5% Pressurization: less than 15Mpa IP: its specifications are up to a ground meter. Applications: thickness of rock, water resistivity, clay content, permeability, resistivity of erosion belt, lithology and oil stratum thickness.