Voice Level HD

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Voice Level HD provides a way to measure environmental sound levels, showing the approximate dB level.
Voice Level HD is the hottest, most feature packed Voice Level on iTunes!
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The app is based on the current calculations to determine the sound pressure level in dB.
Although we have tested the values with professional equipment, we can't ensure the
absolute correctness by international standard.

It also provides an approximate "decibel guide", so that you know what sound levels correspond to a health hazard.

FEATURES:
# Accurate calculation of the ambient noise in dB
# Start or stop Voice Level any time. The last measurements are saved and displayed.
# Measure the sound levels around you, with ease!
# clean and professional interface.
# Average, Peak and Max level displays.
# Digital meter including average, peak and max decibel values.
# Easy to read interface with amazing graphics optimized for the new Retina display!
# Refreshing-rate is adjustable
# Reset settings to defaults.
# Easy to read interface.
# Handy decibel reference chart.

The iPhone's built in microphone is sensitive from 0 to approximately 110 decibels.
Why aren't you getting a 0 decibel reading in a quiet room?
A decibel is an actual measurement of sound pressure
and aside from a vacuum chamber or out in space 0 dB is not really possible to read.
An average quiet room will be in the 40-50 dB range.