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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.

Features:
- 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.