dB turns your iPhone or 2nd generation iPod touch into a simple sound level meter. Getting started is as simple as tapping the app icon in the Home Screen to launch the app.
dB provides default sensitivities for the iPhone's built-in microphone and iPhone/iPod touch headset microphones from Apple. For microphone calibration options, check out SoundMeter.
dB can be used with the built-in microphone of first-generation iPhones, but its readings should not be expected to be very accurate in that case.
NOTE: Although it has been designed to make accurate measurements, with the specified microphones, dB has not been shown to meet ANSI or IEC standards for sound level meters.