Anyone ever retrofit a system to have a moisture sensor on each zone? I have a condo complex looking for this solution (21 zones on 3 separate controllers). I don't know who their original contractor was (neither does the condo board); everything appears (can't see it run...blown out for winter) to be ok materials (Hunter ), although the Hunter distributor around here sells to anyone (i.e. almost any hack job one step above Home Depot will be Hunter materials, not saying that all Hunter installs here are done by hacks though). My supplier catalogs are blank for moisture metering gear; all that normally gets done around here is rain sensors. Any thoughts?