Calm Counter - display the noise level of your class in a visual way

Web Address: http://www.ictgames.com/calmCounter.html

About: Similar to Bouncy Balls, this is another web page that lets you show your pupils how noisy they are being as a class.

The difference with this one though is that it shows you an actual noise gauge so you can tell your class you do not want the noise level "in the red" zone.