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Medical Definition of Tonometry. Tonometry: A standard eye test that is done to determine the fluid pressure inside the eye. Increased pressure is a possible sign of glaucoma, a common and potentially very serious problem if not detected and treated promptly. The pressure inside the eye is measured from the outside.
Differential Manometer. an instrument for the determination of pressure differences (gradients); it is also used to determine from pressure gradients the levels of liquids and the flow rates of liquids, vapors, or gases.ifferential manometer. (engineering). An instrument in which the difference in pressure between two sources is determined from the vertical distance between the surfaces of a liquid in two legs of an erect or inverted U-shaped tube when each of the legs is connected to one of the sources.