manometer

An instrument used for measuring the pressure of liquids and gases.

A sphygmomanometer.

In physiology, an instrument used for determining blood-pressure.

An instrument for determining and indicating the elastic pressure of gases or vapors.

An instrument for measuring the tension or elastic force of gases, steam, etc., constructed usually on the principle of allowing the gas to exert its elastic force in raising a column of mercury in an open tube, or in compressing a portion of air or other gas in a closed tube with mercury or other liquid intervening, or in bending a metallic or other spring so as to set in motion an index; a pressure gauge. See pressure, and Illust. of air pump.

An instrument to measure pressure in a fluid, especially a double-legged liquid column gauge used to measure the difference in the pressures of two fluids.

a pressure gauge for comparing pressures of a gas