instrument of gauge observation

例句：

1. 1. The scientist uses a microscope as an instrument to observe the microscopic world.
   科学家使用显微镜作为仪器来观察微观世界。
2. 2. This is a useful tool for measuring distances and angles.
   这是一个测量距离和角度的有用工具。
3. 3.The engineer used the lever as an instrument to lift heavy objects.
   工程师使用杠杆作为仪器来举起重物。