Johnson Visual Level

1.5: Smoother splash behavior.
1.4: Fixed Hold.
1.3: Now available on Android 1.6+.
1.2: Added Hold button.
1.1: Fixed force close.
Use the camera to see instantly if surfaces are level or plumb, like a virtual laser level.  Digital level display shows angles in Degrees, Percent, mm/m, and in./ft. in decimal and fractional.