audiofrequency meter

例句：

1. 1.The audio frequency meter was used to measure the sound level in the factory.
   音频频率计被用来测量工厂里的声音水平。
2. 2.The audio frequency meter was used to detect any interference in the signal.
   音频频率计被用来检测信号中的任何干扰。
3. 3.The audio frequency meter was used to measure the frequency of the sound waves.
   音频频率计被用来测量声波的频率。