垂直度盘调焦螺旋
/ɐdʒˈʌstɪŋ ˈtjuːb/
n
English: adjustment for vertical-circle image · 垂直度盘调焦螺旋
English · adjustment for vertical-circle imageEspañol · botón para ajustar la imágen verticalmenteFrançais · ajustement de l’image du cercle vertical
释义：Knob that adjusts the sharpness of the image of the vertical circle (graduated from 0° to 360°) in order to read the angles on the vertical axis.