position meter

例句：

1. 1. The engineer used a position meter to measure the distance between the two points.
   工程师使用位置计测量两点之间的距离。
2. 2. The position meter is essential for ensuring accurate alignment of machinery parts.
   位置计对于确保机械部件精确对齐至关重要。
3. 3. The position meter displayed a warning light when the machine was not in the correct position.
   当机器未处于正确位置时，位置计会显示警告灯。