Here are some posters to help your students check themselves for understanding. They simply show you the appropriate hand signal to show you how they feel. They will show you if they feel like they understand what is being taught in the classroom (or the directions to an assignment), if they need a little more help or if they do not understand at all.
There are signs to hang in the room for visual reminders of what each signal is and what they mean. There are signs of three different sizes....half page size, full page size and one page that shows all three signals. Use whichever sign fits your classroom needs (and space).
Print out the size you choose, laminate, then hang up on the wall. You can just staple or get creative and attach them together with ribbon or with binder rings.