Lutron AH-4223 Vane Anemometer/RH/Temp

VANE ANEMOMETER/HUMIDITY/TEMPERATURE
Model : AH-4223
* Air velocity : 0.4 to 30.0 m/s,
ft/min., km/h, mile/h, knots.
* Humidity : 10% to 95% RH, Dew.
* Temperature : 0 to 50 °C, °C/°F.
* All in one, hand held type.
* Vane probe for anemometer.
* Hold, Record ( max., min. ).
* DC 1.5V battery ( UM-4, AAA ) x 4.