optical hygrometer

例句：

1. 1.The optical hygrometer was used to measure the humidity levels in the room.
   使用光学湿度计测量房间的湿度水平。
2. 2. The device is capable of detecting moisture levels in the air with high accuracy.
   该设备能够以高准确度检测空气中的水分水平。
3. 3.The optical hygrometer was a critical tool for monitoring agricultural conditions.
   光学湿度计是监测农业条件的关键工具。