Use your smart phone to know noise level of environment.
miidio Noise Meter uses your smart phone to calculate noise level or sound pressure in dB.
1. noise level calculation
2. running as background service.
3. homescreen widget
4. alarm when noise value is above a value, you can specify it.
Note: there may be different maximum value among different smart phones which is decided by manufacturer, such as Galaxy S3(81dB), Galaxy Note(91dB), Galaxy S2(98dB), Galaxy Tab 7.7 (90dB).