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.
This can be modified for my room to tell teachers it's a safe learning environment. Remind your students how special they are every time they enter your classroom! 19 back-to-school classroom decor ideas