Elcometer G309----1 Delta T Hygrometer (0% to 100% RH, TΔ, TS)

Operating Range: -20ºC to +80ºC
Air Temperature (TΔ): -20ºC to +80ºC
Surface Temperature (TS): -20ºC to +80ºC
Relative Humidity (RH) & Accuracy: 0% to 100% RH (±3%) (Default upper limit 75%, user adjustable)
Resolution: 0.1ºC (0.1ºF) / 0.1%
Power Supply: 2 x AA 1.5V Batteries or via USB Cable
Battery Life: Greater than 40 hours (Backlight off)
Dimensions: 180 x 75 x 35mm
Weight: 300g
Packing List: Elcometer 309 Delta T Hygrometer, wrist strap, 2 x AA batteries, protective pouch with belt clip, RH probe calibration certificate and operating instructions

Datasheet

Manual