Finding JOY in Grade: Classroom Management: The Purple Clipboard. I wonder if this would be hard to maintain accurately all day, might work better in a middle/high school setting for periods than all day elem management. Like this idea.
My teacher uses a Noise Meter similar to this one. The Noise Meter is a cool way to remind students the correct noise level that they should be using! You just use the paper clip and move it to the appropriate noise level the students should be using.