reed frequency meter

例句：

1. 1. The engineer used a reed frequencymeter to measure the sound level inthe factory.
   工程师使用芦苇频率计测量工厂里的声音水平。
2. 2. The reed frequencymeter was used to detect the presenceof pollutants in the water.
   芦苇频率计被用来检测水中污染物的存在。
3. 3.The reed frequency meter was accurateand reliable, providing valuable data for thestudy.
   芦苇频率计准确可靠，为研究提供了宝贵的数据。