optical gage

noun

Definition of optical gage

: a gage (as a micrometer comparator) that makes no direct contact with the object measured but measures an optical image of it

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“Optical gage.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/optical%20gage. Accessed 1 Oct. 2020.

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