It would be nice to have an option or report that shows the moisture level graphs for all zones on one single page view. Ability to overlay them on one another (drag and drop) would be nice too.
We have discussed this before, my main concern would be laying those graphs over each other may be a bit cluttered. You mentioned dragging and dropping the layers, do you mean the individual zones?
Yes. I agree on a small view it might be too cluttered but if we can display it full screen(hint, hint) it would be a functional tool.