Thanks Steve, I think I've got mine calibrated. I'm having a bit of trouble too. And it's not a quick process! I suspect that there's a typo in the calibration manual, maybe add one stop should be - and minus one stop should be +.
Rick, so the higher the better? Sounds right.
Ath, yes, I'm trying to measure the highlights and blacks at a height that is 2 or maybe 3 stops larger than the small size.