WDDS-2C/3C digital resistivity meter (hereafter also referred to as WDDS-2C/3C mainframe or WDDS-2C/3C meter) is a new generation of DC resistivity equipment which is based on a series of advanced electrical equipment of BTSK for resistivitysurvey, and adopts 32-bit microcontroller technology and 24-bit A / D technology development. It applies for metal and nonmetal mineral resources detection, city geophysical exploration, railway and bridge inspection and so on, hydrology and engineering geology as seeking for ground water, inspecting dam base and flood protection levee for incipient faults, geothermal prospecting.