A bubble level or spirit level is usually used for making sure that a surface is flat, even, or straight. The app features a bull's eye level and two tubular level. It also displays the angles in X and Y axis.
The special feature that sets this app apart from other bubble level apps, is that this app doesn't require a perfectly flat surface to properly calibrate the sensors. This means that you can calibrate it on an uneven surface. This eliminates systematic error, which can be introduced when calibration is done against a physical surface, which most other apps do.
This is achieved by using algorithms to enable the device to calibrate against the earth's gravitational field, ensuring that the readout is of high accuracy.
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