Works on my old iPad2r – dB Sound Level Meter - Noise Volume Measure (Decibels) Free Review

I can't speak as to accuracy, but this is probably just fine for delta measurements. Totally works and no annoying ads! I was so happy about that I clicked over to the sponsors page!
Review by MarkusXXXL on dB Sound Level Meter - Noise Volume Measure (Decibels) Free.