Smart Bubble Level with vertical angle gauge, horizontal angle gauge, and bull eye level showing a surface inclination. The tool is also known as Spirit level, perfect for tilt measurement and surface levelling.

Main Features:
• Calibration - Increases the accuracy of the spirit level. It compensates for the curvatures of the smart-phone like a protruding button or camera. You can calibrate one flat surface and one edge. The selected place will be shown on the right bottom button.

• Save - This allows you to save the bubble level gauges in a notebook and give them a name.
• Board - Allows you to read the saved spirit level.
• Calibration Time - Allows you to extend result time calculating from the sensor giving steadier spirit level results. No need for a good accelerometer.
• Secondary Calibration - This option is beneficial for engineers in extreme cases. If you need to use a different place or edge the smart-phone on the screen, switch the bottom right button to 2 and calibrate for these surfaces. Toggle calibrations depending on the surfaces used.

The precision of this levelling tool depends on a smartphone accelerometer and the correct calibration.