Civil Engineering - Hydraulics - Discussion

A piezometer is either a device used to measure liquid pressure in a system by measuring the height to which a column of the liquid rises against gravity or a device which measures the pressure of groundwater at a specific point. A piezometer is designed to measure static pressures and thus differs from a pitot tube by not being pointed into the fluid flow.

For very low pressure. it was the current meter.

Piezometer very low pressure.
Manometer pressure in channels.
Diff manometer difference in pressure.
Barometer atmospheric pressure.