Piezometers are used to measure ground water elevations and pore water pressures in bore holes, dams, embankments, concrete structures, pipelines, wells, mines, tunnels etc. It has a stainless steel pressure sensitive diaphragm with a tensioned steel wire. The VW piezometers convert water pressure on the diaphragm to be measured into an equivalent frequency signal. The pressure on the diaphragm changed by fluid pressure causes a change in tension of the wire. The wire excited by the plucking vibrates at its resonant frequency. The frequency signal transmitted through a cable to the readout unit.