bouton de réglage du micromètre optique
/butˈɔ̃ də- ʁeɡlˈaʒ dy- mikʁomˈɛtʁ ɔptˈik/
n
English: micrometer screw · 微调测微螺旋
Sens：Screw with a head graduated in minutes that is turned to set the index arm precisely.
English: micrometer screw · 微调测微螺旋