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This pdf file includes a volume chart with 12 different black and white backgrounds. volume levels go from level 0 (no talking) to level 4 (outdoor voice) and a one page poster for each volume level.
Some teachers like to clip a clothespin next to the expected voice level, while others like to post a large image of the level.
Backgrounds and graphics from www.mygrafico.com (Lilly Bimble)