meatometer

me·a·tom·e·ter

(mē'ă-tom'ĕ-tĕr),
An instrument for measuring the size of a meatus, especially the meatus of the urethra.
[meato- + G. metron, measure]

meatometer

(mē-ă-tŏm′ĕt-ĕr) [L. meatus, passage, + Gr. metron, measure]
Device for measuring the size of a passage or opening.