例如，一个兴趣点检查应用程序可能需要更高定位精准度，一个城市级别的位置校准定位器就可以满足零售商店。
For example, a points of interest check-in application would require higher location accuracy than say, a retail store locator where a city level location fix would suffice.
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.
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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