coarse adjustment knob – Definition, Pronunciation & Pictures

coarse adjustment knob /ˈkɔːs ɐdʒˈʌstmənt ˈnɒb/ n

中文：粗调旋钮

Meaning：Medium-precision focusing device for adjusting the distance between the objective and the object under study.

Found in these illustrated scenes（2）

Binocular microscope Microscope