If there was such a thin, for stage work, it sounds like what you need is a volume meter. In some school cafeterias they have a gren light, yellow light, read light par that changes as the kids get louder. You get into the red light and the lunch monitors come out and give the kids a "reminder" to not get so noisy.
Park one of those in front of you so you can see it and don't let the lunch ladies come down on you !
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