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Decibel meter apps for your phone
SPL Meter on the App Store
SLM-700 SPL meter - omnitronic
Open Sound Meter
Sound Meter – Apps on Google Play
Looking for the best sound level meter app – Faber Acoustical Blog
Sound Meter for Android - Download the APK from Uptodown
USB Bass Meter - simple wired SPL meter for iOS, Android and Windows - SPL Lab - caraudio and racing measuring devices - #1 Car Audio Enthusiast Forum in the world! | SMD | Meade916
Galaxy Audio CM-170 Sound Pressure Level Meter | Audio Level Meter