focometer

/foh-kom-i-ter/US // foʊˈkɒm ɪ tər //UK // (fəʊˈkɒmɪtə) //

焦距仪,测定仪,风向标,测距仪

Definitions

n.名词 noun

1
Optics.
- : an instrument for measuring the focal length of a lens or other optical system.