测音器

例句：

1. 1. The engineer used a sound level meter to measure the noise level in the factory.
   工程师使用声级计测量工厂里的声音水平。
2. 2. The teacher asked the students to use a sound level meter to check the volume of their music.
   老师要求学生们使用声级计检查他们音乐的音量。
3. 3. The scientist used a sound level meter to study the effects of noise pollution on human health.
   科学家使用声级计研究噪声污染对人类健康的影响。