condenser adjustment knob
/kəndˈɛnsəɹ ɐdʒˈʌstmənt ˈnɒb/
n
English · condenser adjustment knob中文 · 聚光镜调节钮Español · tornillo de ajuste del condensadorFrançais · vis de réglage du condenseur
意味：Screw that centers the condenser’s light beam in the field of vision by moving it along a horizontal plane.