The sliding sight on a surveyor's leveling rod .
标板：勘测水准标尺上的滑动观测器。
The working strength of the survey person can be reduced, and the idea burden of the perpendicularity of the manual control leveling rod can be relieved.
减轻了测量人员的工作强度，解除了人为控制水准尺垂直的思想负担。
The working strength of the survey person can be reduced, and the idea burden of the perpendicularity of the manual control leveling rod can be relieved.
减轻了测量人员的工作强度，解除了人为控制水准尺垂直的思想负担。
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