This app turns your smartphone into a bubble level (spirit level).

With 4 different viewing options, this level can calibrate with all 4 sides as well as show the angle and slope in percentage or roof pitch. Comes with several sound effects and orientation locking.

Bubble level works with:
Samsung Galaxy, HTC, Motorola, Xiaomi, Huawei and Sony.

https://hotandroidappsandtools.com/legal/privacy/pocketbubblelevel
https://hotandroidappsandtools.com/legal/terms/pocketbubblelevel