The VPD number reported by the app is quite different from the VPD numbers in the charts. For example: The Temp is 81f and the humidity is 60%. The app shows a VPD number of 1.8, however the chart indicates this would translate to a VPD of 1.2. why such a big difference. In both cased the leaf differential is 2.
Thanks for your help.
Admin edit: see post below:
I also had mistakenly set the leaf offset to a positive rather than a negative number. That created much of the erroneous number.