depth gage vs depth gauge

depth gage and depth gauge both are nouns.

Word	Noun	Adjective	Verb	Adverb
depth gage	Yes	No	No	No
depth gauge	Yes	No	No	No

As nouns, depth gage and depth gauge are synonyms defined as:

depth gage and depth gauge: a gauge for measuring the depth of grooves or holes or other concavities

depth gage (noun)	depth gauge (noun)
a gauge for measuring the depth of grooves or holes or other concavities	a gauge for measuring the depth of grooves or holes or other concavities