Great free app
First off, ignore those people who say this app is crap and not accurate. I have dealt with db meters for at least the last 15 years and this app was spot on. Normal conversation in the 3 to 5 foot range is between 60 and 70 db. Lying in your bed or in a quiet library is still in the 30 to 40 db range. This app is a no frills db meter that works!
Pianomanharry about
Decibels: dB Sound Level Meter