Large Vane CFM/CMM Anemometer/Psychrometer plus CO2
Measures Air Velocity, Air Flow, Relative Humidity, Wet Bulb, Dew Point and Carbon Dioxide
4" (10cm) vane allows for more precise readings on larger size ducts
Air Velocity, Air Flow, Relative Humidity, Wet Bulb and Dew Point, Carbon Dioxide (CO2)
Built-in thermistor for air temperature
Multipoint and timed average calculations
Min/Max, Data Hold, and Auto power off
Complete with four AAA batteries and hard carrying case
datasheet:http://www.extech.com/instruments/resources/datasheets/AN300seriesdata.pdf