REMEMBER!! Most smart phone microphones were aligned to human voice (300-3400Hz, 40-60dB).
Therefore maximum value is LIMITED by manufacturers, and very loud sound(100+ dB) cannot be recognized. Moto G3 (max.80), Galaxy S6 (85dB), Nexus 5 (82dB), HTC (82dB)...
You can trust the result in routine-noise levels (40-70dB). Please use it as an auxiliary tool.
Vibrometer uses the phone sensors to measure vibration or an earthquake, and it shows a reference as a seism detector.
The measured values are related to Modified Mercalli Intensity scale (MMI). If it is inaccurate, you can calibrate it so that maximum value is about 10-11.
Please use the results only for reference because android devices have a wide variety of performance and sensitivity.
Pro version added Features:
- No ads
- Sound Meter and Vibrometer are integrated
- Statistic menu (line chart)
- CSV file exporting
- Line-chart duration
- More models are calibrated
Requirements: Android 4.1+
HomePage -

https://play.google.com/store/apps/details?id=kr.aboy.sound&hl=en

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