db Meter is a free sound meter app that measures environmental sound levels and plots them over several hours.
Toggle between four modes to see the maximum, minimum, average and 30-second trail decibel values for different sound measuring applications.
The sound meter's scale is auto-generated to best fit your measured decibel values.
It also features a night mode and dB-calibration by reference sound.
Please note that the maximum decibel reading of most cell phone microphones is limited to approximately 85 dB.
This sound measuring app displays unweighted sound levels.
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