PQWT TC300 Geophysical Underground Water DetectorPQWT TC300 Geophysical Underground Water Detector Depth: 300 meters (984 ft) PQWT TC300 automatic mapping water detector is based on the Earth's electromagnetic field as the field source, based on the difference in the conductivity of different underground geological structures, and by studying the variation law of the electric field components at different frequencies to study the geological structure and changes, to find groundwater resources by