reading wand
... reading value per division of vernier 游标每格读数值 reading wand 读数杆 readjustment 重[新]调[整]，重校 ...
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光碥读数杆 optical oode reading wand
光码读数杆 optical code reading wand
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两尺杆形成一个角重叠于被测角上，反映在刻度尺上的角度刻线读数就是被测角度。
The two ruler rods form an Angle which is overlapped on a measured Angle. The read number of the Angle reticle reflected onto the graduation ruler is a measured Angle.
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