iHandy Level Free may be a handy app to keep on your phone for those times you are hanging a picture on the wall (to get things straight). Not only handy, but a beautiful app as well.
NOTE: Because the sensor inside every individual device could be built slightly differently, to make the level more accurate for your device, you need to calibrate before use.
1. Find a flat surface.
2. Hold your device upright , put the bottom edge of the device on the flat surface, then press Calibrate button (the one with a target image on it) to calibrate the portrait mode.
3. Turn your device 90 degree clockwise , again keep it upright, and put the current bottom edge (long edge) on the flat surface, then press Calibrate button to calibrate the landscape mode.
4. Put the back of the device against the surface, then press Calibration button to calibrate the face-up mode
5. You are ready to go!
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