Vibration Meter is a free Android app developed by Smart Tools co. It is a part of the Smart Tools collection and uses the acceleration sensor to measure vibration or an earthquake. The app shows a reference as a seismic detector (seismograph) and the measured values are related to the Modified Mercalli Intensity scale (MMI). However, it is recommended to use the result only for reference as Android devices have a wide variety of performance and sensitivity.

The app has a simple and user-friendly interface with material design. It also has an alarm level and beep sound feature that can be customized as per your preference.

The pro version of Vibration Meter has additional features like no ads, sound meter, statistic menu, CSV file exporting, and screen capture. If you want more tools, you can download the Smart Meter Pro and Smart Tools package.

Overall, Vibration Meter is a useful app for those who need to measure vibration or an earthquake on their Android device. However, it is important to keep in mind that the accuracy of the app may vary depending on the device's performance and sensitivity.