- an instrument for measuring the frequencies of tones, as a tuning fork or a graduated set of tuning forks.
- any of various physiological instruments for measuring intraocular pressure or blood pressure.
- an instrument for measuring vapor pressure.
- an instrument for measuring the pitch of a sound, esp one consisting of a set of tuning forks
- any of various types of instrument for measuring pressure or tension, such as the blood pressure, vapour pressure, etc
