Rugged, reliable and unaffected by frost, the pneumatic piezometer permits water pressure monitoring in permeable soil. The piezometer transducer consists of a stainless steel body equipped with porous stone and rubber diaphragm connected to a pair of flexible tubes in a common PE jacket. Piezometer operation requires a supply of pressurized inert gas (dry nytrogen). Water pressure is balanced with pneumatic pressure supplied from the gas cylinder, adjusted through the readout unit. Water pressure measurement is displaied directly in KPa on the LCD of Sisgeo pneumatic indicator.