VPD humidity controller US version

[Nbsdsailor]

Has anyone seen a VPD humidity controller? Instead of turning the humidifier on/off according to the RH, this controller turns it on/off according to current VPD (temp dependent). I found one from a UK manufacturer, but their electronics are not compatible with US power.
https://www.amazon.com/GLOBAL-AIR-SUPPLIES-G-A-S-Intelligent/dp/B081H7T82H