ALEXANDRIA, Va., Oct. 21 -- United States Patent no. 12,765,475, issued on Oct. 20, was assigned to AC Infinity Inc. (City of Industry, Canada).

"Hand-held vapor pressure deficit measuring and controlling device and method" was invented by Jimmy Liu (Brea, Calif.), Daniel Yu Hsu (Upland, Calif.), Wilbur Y. Cheng (Chino Hills, Calif.) and Wei Ying Shao (Alhambra, Calif.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A hand-held VPD measuring and controlling device for plant cultivation is disclosed. The hand-held vapor pressure deficit (VPD measuring and controlling device includes: a device body with a barrel, a handle, and a trigger; a screen for displaying information on one end of the barrel of the device...