tonometer

Any of various instruments for measuring pressure or tension.

An instrument for measuring hydrostatic pressure within the eyeball, used to detect glaucoma.

An instrument, such as a graduated set of tuning forks, used to determine the pitch or vibration rate of tones.

An instrument for determining the degree of intravascular blood-pressure.

An instrument for measuring strains within a liquid. A thermometer with very thin elliptical bulb may be used, as the pulling forces distend the bulb, causing the mercurial column to descend.

In music, an instrument for measuring the pitch of tones; especially, a tuning-fork, or a graduated set of tuning-forks, whose pitch has been exactly determined.

In medicine, an instrument for measuring the degree of tension in the eyeball in cases of glaucoma.

An instrument for determining the rate of vibrations in tones.

An apparatus for studying and registering the action of various fluids and drugs on the excised heart of lower animals.