Geographic Surveying InstrumentChina 2D Electric Resistivity Survey Tomography, Electrical Resistivity Imaging, Geophysics Resistivity Meter for Undergound Water Detection Exploration, Find details about China Surface Resistivity Meter, Underground Geophysics from 2D Electric Resistivity Survey Tomography, Electrical Resistivity Imaging, Geophysics Resistivity Meter for Undergound Water Detection Exploration