1) Measuring device 2) Measuring instrument 3) Measuring system 4) Measuring instrument 
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 (more precisely, the piezometric head) of groundwater at a specific point. A piezometer is designed to measure static pressures, and thus differs from a p...
instrument for measuring pressure or compressibility
• (n.) An instrument for measuring the compressibility of liquids. • (n.) A gauge connected with a water main to show the pressure at that point.
A non-pumping well, generally of small diameter, for measuring the elevation of a water table (i.e. static water level).
Pi`e·zom'e·ter noun [ Greek ... to press + -meter : confer French piézomètre .] 1. (Physics) An instrument for measuring the compressibility of liquids. 2. (Physics) A gauge connected with a water main to show the pressure at that point. 
Type: Term Pronunciation: pī′ĕ-zom′ĕ-tĕr Synonyms: piesimeter
[n] - a measuring instrument for measuring high pressures
piezometer (pigh i ZAHM i tuhr) 1. A system for testing piezoelectric materials. 2. Any of several instruments for measuring the pressure of a fluid or the compressibility of a substance when subjected to such a pressure. 3. A device used to measure fluid pressure, particularly a device inside a vessel that contains gas or liquid. 4. A device......
A nonpumping well, generally of small diameter, for measuring the elevation of a water table. 
noun a measuring instrument for measuring high pressures