Use APKPure App
Get Precise Angle Meter old version APK for Android
Meaure angles with digital precision
Show your phone's orientation in the X, Y, and Z plane, with digital precision. If you need maximum precision use a rigid phone stand and then zero out the measurements on a known-flat surface. Doing this I can get error down to less than 1 degree, although this may depend on the quality of your phone.
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