... wear-resistant and resisting corrode• Smooth rotating, comfortable operation, with locking device, very easy to use• Shapely configuration, the inverted ... ;1° increments ,a does value of vemier 6'; with locking devices. The stage is through particularly fabrication processing(graphite ... 360°rotatable,0,90,180,270 four type graduations,with locking device and can shift out the light pathReflection:built ...