Before recalibrating the system, you need to make sure the rv is really level. I use a 3' level and take readings for and aft and side to side on the kitchen floor and also test the walls at various spots around the rv.
Once I manually adjusted the level up to my findings using the level, then I used John's instructions to zero out and recalibrate the system and double check with the level. My pen no longer rolls off the counter!
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