focimeter

例句：

1. 1. The focus meter on the camera is very sensitive.
   相机上的聚焦仪非常敏感。
2. 2. The scientist used a focus meter to measure the distance between the two objects.
   科学家使用一个聚焦仪来测量两个物体之间的距离。
3. 3. The focus meter was used to adjust the focus of the camera lens.
   聚焦仪被用来调整相机镜头的焦距。