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great tool, just needs a reliable way to calibrate.
my only issue with the ac infinity vpd tool is that I am not told whether each individual tool has been precisely calibrated for me. the option for calibration of temperature and humidity leaf temp etc is given without indication from aci whether we need to find a way to calibrate it ourselves. I mistakenly thought it was intended to be as accurate as possible straight out of the box. however I now see that it is best to use multiple thermometers and hygrometers in order to calibrate all of my aci products ie the vpd tool and the smart controller pro 69. I would love to know a good accurate way of calibrating the vpd tool precisely to allow the precise calibration of the smart controller but I feel confident I can settle on the average between my brand new themometer hygrometer and I have a mercury thermometer at least. I have tested the vpd tool all over the house inside and out checking humidity and temperature readings and I can see it is very precise and excellent tool once I have verified through multiple other units the readings it shows me. I love all of the aci products I have purchased and I feel confident in saying the results are immediately apparent since upgrading my setup. I am seeing the best garden since I started my indoor garden 3 years ago. I can't say enough about aci products.