Extech 451181 Datalogging/Printing Anemometer+PsychrometerExtech 451181 Datalogging Printing Anemometer+Psychrometer Measure, record, print and download air flow measurements to a PC Key Features: Simultaneously measures and displays Air Velocity, Temperature,Humidity, Wet Bulb, plus calculates CFM CMM Manually log measurements (99 points) or setup time interval for automatic logging (2400 points) Datalogger date time stamps and stores data for later recall, printing or downloading to a PC Thermal printer