transit declinometer vs declinometer

transit declinometer and declinometer both are nouns.

Word	Noun	Adjective	Verb	Adverb
transit declinometer	Yes	No	No	No
declinometer	Yes	No	No	No

As nouns, transit declinometer and declinometer are synonyms defined as:

transit declinometer and declinometer: an instrument for measuring magnetic declination

transit declinometer (noun)	declinometer (noun)
an instrument for measuring magnetic declination	an instrument for measuring magnetic declination