Airspeed Anemoscope Anemometer -20~60 C TENMARS TM-403 Air Velocity Meter Features: 30mm 6 plastics blade. Fast response Temperature sensor.  Air flow calculate function. Max/Min/Avg and data hold. Auto power off with disable function. Low battery indication. Datalogging capacity: 99 records. Memory recall function. Backlight function. Atmospheric Pressure Sensor Humidity Sensor Specification:        Model    Velocity     Flow    99 Record    Temperature    Humidity    Pressure        TM-401    V    V    V                    TM-402    V    V    V    V                TM-403    V    V    V    V    V            TM-404    V    V    V    V    V    V     Air velocity measurement:       Unit    Ranges    Resolution    Accuracy        m/s    0.4~25    0.1    +/- 2%+0.2        Km/hr    1.5~90    0.1    +/- 2%+0.8        mph    0.9~55    0.1    +/- 2%+0.4        knots    0.8~48    0.1    +/- 2%+0.4        ft/min    79~4921    1    +/- 2%+40        Beaufort    1~10    1    --     Air flow(Volume) calculate:       Unit    Ranges    Resolution    Accuracy        CMM    0~9999    1    --        CFM    0~9999    1    --     Temperature measurement:       Unit    Ranges    Resolution    Accuracy        ºC    -20~60    0.1    +/- 1ºC        ºF    -4~140    0.1    +/-1.8ºF     Humidity measurement:       Unit    Ranges    Resolution    Accuracy        %RH    20~80    0.1    +/-3.