One is Too many!

I run sound at my church of 400, and needed a decibel meter. My sound is set at 79-81 decibels; but according to this ap its at 90. I even lower my volume to 10% but it was still at 90 decibels. Restarting the ap doesnt help either. Dont bother with this dud ap.

Boer Goat about Decibels: dB Sound Level Meter