apertometer
noun
ap·er·tom·e·ter
ˌap-ər-ˈtäm-ət-ər 
: an instrument for measuring the numerical aperture of objectives (as those of a microscope)
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“Apertometer.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/apertometer. Accessed 24 Apr. 2024.
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