Scales are used to monitor students and their understanding of what is being taught.
Last year I used a similar number scale but I wanted to make a scale with the jungle theme I am using. I made them in two sizes.
Give a scale to each student. You can simply ask the students to hold up the number they feel they are at or you can use clothespins and ask the students to place the clothespin on the number they feel they are at. (I ask students during and after the lesson.)
There are 4 different scales so you can choose the one you like the best and also a full-paged scale of each to hang up in specific areas of your classroom.