Calibrating instructions: Put your phone/tablet on a back on a flat surface that is already horizontally aligned. Press "Calibrate" button and it's accurate as a physical tool. It is common that internal sensors of android device aren't aligned from the factory, so if you accuracy you're after, calibrating has to be done.
Take the opportunity to download the installer of Accurate level meter 1.0 free of charge and have a look at users' reviews on Droid Informer. The app is designed for Android 4.3 and higher. This application is completely safe to download. Raimundas Indriulis is the creator of Accurate level meter that can be found in the Tools category.
The most recent update of the app was released on Nov 28, 2016 and this application has been set up by over 100 users. Google Play shows that Accurate level meter is rated 4.3 by its users.
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