Portable Humidity Meter HM550

Features
Adopt digital signal sensing technology, good measurement repeatability, fast response and high sensitivity.
Digital display with back light gives exact and clearly reading although you stay at the somber conditions.
Able to measure Humidity, Temperature, Wet Bulb Temperature,
Optional USB or Blue Teeth
Data hold function. 
Low battery alert.

SPECIFICATION
Display:10mm Dispaly 
Parameters Measured:
Humidity and Temp, Wet Bulb Temp
R.H range:       10-95%
R.H resolution:  0.1RH%
R.H accuracy:    2.5%±1%RH
Temp range:      -20℃~60℃(-4~140℉)
Temp resolution:  0.1℃/0.1℉
Temp accuracy:    ±0.5°C
Wet Bulb Temp range:-20℃~60℃(-4~140℉)
Wet Bulb Temp resolution: 0.1℃/0.1℉
Wet Bulb Temp accuracy:  ±0.5°C
Sampling Time: less than 0.5s
Power supply: 
4x1.5 AAA size (UM-4) battery
Dimensions:
Main Unit: 185mm×70mm×30mm
Weight:
125g (not including batteries)