Chill I just share my experience to help you improve your app  don't be mad when you get a bad review I mean there are people that gave you 1 star because they believe earth is flat...Anyway I like it when developers respond and I see that it bugged you so much so I changed the stars to 5. I believe that a manual calibration via camera for example or something like that would improve the user's experience.
September 25 2016