Geokon originally invented the VWP in the 1980s. They are still leaders in the field today, offering standard VWP, VWP with internal logging, auto resonant, high temperature, multilevel and many others. The systems come with separate data loggers, hand held readout units for testing, system set-up and optional data logging. Piezometer pressure ranges are from 0-300 MPa (0-30 m water) to 0-20 MPa (2000 m water)

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