The AN340 is a CMM/CFM Anemometer/Psychrometer Data logger. This meter measures Air Velocity/Volume, Temperature, Humidity, Wet Bulb, and Dew Point. User can store up to 12,000 readings for data analysis. Manually store/recall up to 99 reading. Complete with external mini vane probe, Windows compatible software, USB cable, 6 AAA batteries, and hard carrying case.