3 free classroom noise level monitors - Resource hub for schools and districts
8 Best Noise Meters to Monitor Your Classroom
Noise Control Strategies for the Classroom | SandraRief.com
Teach Starter - How neat is this...monitor classroom noise level with virtual bouncy balls! It uses the microphone on your laptop, you can 'see' the noise level and so can your students!!
Bouncy Balls: A Good Tool for Managing Classroom Noise - Educators Technology