Basic sound meter, works on 3GS – SoundLevel: Decibel Reading Review

Well, it's free, and gives me just what I need: the decibel rating of the sound. It works fine on my iPhone 3GS, directly from the built-in microphone. It's free, so I'm not asking for much--and it works, so I'm happy :)
Review by KObano on SoundLevel: Decibel Reading.