* 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 oC, oC/oF. * All in one, hand held type. * Vane probe for anemometer. * Hold, Record ( max., min. ). * DC 1.5V battery ( UM-4, AAA ) x 4.