A bubble level. Hold any of the phone''s four sides against an object to test it for plumb/level, or lay it down on a flat surface for a 360° level.
- Calibrate each side of the phone independently.
- Show the numeric angle.
- Speak the angle out loud.
- Flash the light, beep, or buzz when level.
- Show the angle as pitch.
- Tap screen to lock angle.