3 free classroom noise level monitors - Classcraft Blog - Resource hub for schools and districts
Classroom Noise Monitor Apps That Teachers Will Love
Classroom Noise Meter
Yacker Tracker Noise Level Monitor Detector - Visual LED Traffic Signal Light - Great for Schools, Classrooms, Cafeterias, Hospitals and More - 17" : Amazon.ca: Industrial & Scientific
noise meter
Loud Meter For Classroom | Primary Resources | Twinkl