HANDHELD ENVIRONMENTAL MONITOR, CAPTURES LEAF VPD AND TEMPERATURE A digital thermal gun designed to measure plant leaf VPD for optimized control over your grow environment. Captures environmental data that can be used to calibrate smart controllers that manage grow devices. First of its kind to measure air and leaf VPD, in addition to ambient temp, leaf temp, and relative humidity. Infrared technology utilizes 12-point laser positioning to precisely highlight your exact area of measurement. Automatically saves the historical data from your previous readings to track shifting climate conditions.