Vibration Meter is in the 4th set of Smart Tools collection. This app uses acceleration sensor to measure vibration or an earthquake, and it shows a reference as a seismic detector (seismograph). 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 result only for reference because Android devices have a wide variety of performance and sensitivity. * Main features: - Alarm level - Beep sound - Material design * Pro version added features: - No ads - Sound Meter - Statistic menu - CSV file exporting - Screen capture * Do you want more tools? download [Smart Meter Pro] and [Smart Tools] package. For more information, watch YouTube and visit the blog. Thank you.