tonometer vs measuring device

tonometer and measuring device both are nouns.

Word	Noun	Adjective	Verb	Adverb
tonometer	Yes	No	No	No
measuring device	Yes	No	No	No

As nouns, measuring device is a hypernym of tonometer; that is, measuring device is a word with a broader meaning than tonometer:

tonometer: measuring instrument for measuring tension or pressure (especially for measuring intraocular pressure in testing for glaucoma)
measuring device: instrument that shows the extent or amount or quantity or degree of something

Other hypernyms of tonometer include measuring instrument, measuring system.

tonometer (noun)	measuring device (noun)
measuring instrument for measuring tension or pressure (especially for measuring intraocular pressure in testing for glaucoma)	instrument that shows the extent or amount or quantity or degree of something