Light and Good app It is the lightest bubble level app that works well. its calibration data does not have a reset key  however by holding the calibration key it can be reset. If it shows inclinations 0 & 10 as lines in both sides of tubular level and a circle in spirit level  it will be more useful. Also in the spirit level its better to show the value of maximum inclination and its direction. The maximum inclination is square root of sum of squares of inclinations in x and y directions.
December 18 2015