No calibration???

The app seems to work fine but it is out 2 degrees. The app page says you should calibrate it, but doesnt say how, no where.
After lots of trying this and trying that I gave up and decided to email the app source as per his offer "if you have trouble calibrating... just email me" But there is no email for him- no where. Not even on his web site.
So, no cigar.

BTate about TiltMeter