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by kalleboo 4631 days ago
According to users in the thread about this on macrumors, the error isn't linear, and if you calibrate it, you still get inaccurate readings once it's off-level.

  > The issue is that it cannot be calibrated out. I've tried, 
  > it can't be done. You can zero it in one orientation but then 
  > the error is doubled in the opposite orientation.