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.
dislike having long lines of students waiting for me to edit their papers, I have them put their numbered clothespins on my clipboard so that I'll know who is ready to go. This would also be great for students waiting to take AR tests!