We use accelerometer, magnetometer and gyro for orientation sensor calibration.
A simple tool that uses your device accelerometer, magnetometer and (if present) Gyroscope to calibrate your orientation sensor.
It can be useful to fix some compass direction issues. It is also good for repairing some tilt sensor problems.
The measurements are calculated in degrees in the x (Azimuth), y (Pitch) and z (Roll) axes.