The REED R6040 is a handheld psychrometer/thermo-hygrometer that reads temperature, relative humidity, dew point, and wet bulb temperature simultaneously on a backlit LCD. It covers -20 to 70C and 0-99.9% RH, logs up to 999 data sets internally with adjustable sampling intervals, and connects via USB-C to REED's PC software for charting and analysis. Adjustable high/low alarms with color-coded indicators make it useful for HVAC and environmental monitoring tasks.