When measuring system is calibrated, different standard rod gets different calibration coefficient.
在系统标定时，不同标准件的标定系数不一致。
In dynamic measuring process, the same standard rod gets different measuring outcome in different place within measuring range.
动态测量时，同一个标准件在测量范围内的不同位置测量结果不同。
As a scale cover on the water regulating valve cover is marked with scales, by matching with a standard rod, the regulated position of the water regulating valve cover at each time can be known.
调水阀盖上的刻度盖标有刻度，配合标准杆，就可以知道每次调水阀盖所调的位置。
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