dew-point hygrometer

例句：

1. 1.The dew-point hygrometer was used to measure the humidity in the room.
   使用露点湿度计测量房间的湿度。
2. 2.The weather forecast predicted a low dew-point temperature for tomorrow.
   天气预报预测明天的露点温度很低。
3. 3. The scientist used the dew-point hygrometer to study the effect of temperature on the water vapor content in the air.
   科学家使用露点湿度计研究温度对空气中水蒸气含量的影响。