检查定位标是否对零线：将重锤放下观察定位标上刻线是否与零线重合，有偏差时可调整定位标两侧的螺钉。

Ensure that the height marker is on zero graduation: Fall down the cylinder to check, if any deviation, adjust the two screws of the height marker.

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实验结果表明该算法能准确识别出对准刻线，定位精度可达微米量级，具有一定的实用价值。

The experiment result showed that this method can accurately identify the aligned lines, the positioning accuracy can reach micron grade, and has a certain practical value.

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