spectral hygrometer

例句：

1. 1.The spectral hygrometer was used to measure the humidity levels in the room.
   光谱湿度计被用来测量房间的湿度水平。
2. 2. The scientist used the spectral hygrometer to study the effects of temperature on plant growth.
   科学家使用光谱湿度计研究温度对植物生长的影响。
3. 3. The spectral hygrometer is a crucial tool for monitoring the moisture content in soil.
   光谱湿度计是监测土壤水分含量的关键工具。