mu-metron

例句：

1. 1. The engineer used a mu-metron to measure the distance between the two buildings.
   工程师使用一个测量仪来测量两座建筑物之间的距离。
2. 2. The surveyor used a mu-metron to map out the terrain before beginning construction.
   测绘员使用一个测量仪来绘制地形图，以便开始施工。
3. 3. The surveyor's tools are essential for accurate measurements and surveying.
   测绘员的工具对于准确的测量和勘测至关重要。