... DC Resistivity (IP) Meter. It is mainly used for searching underground water. DZD-6A Multifunction DC Resistivity(IP) MeterApplications ... it is widely used in searching for groundwater. • It is widely used in geologic prospecting for hydrogeology, engineering and environment, ... field potential Vp, self-potential voltage Vsp, supply current I, apparent resistivity Ro, apparent polarizability Ms, half-life ...