Check the listing for details. EXTECH 407123 Anemometer, 40 to 3,940fpm, 32 to 122F 4KC29. Condition: New. Listed at 534.44 USD. Anemometer, Minimum Velocity Measured 40 fpm, Probe Diameter 0.5 in, Probe Type Hot Wire, Maximum Velocity Measured 3,940 fpm, Minimum Dew Point Measured Not Applicable, Minimum Hot Wire Probe Length 10 in, Minimum Operating Temperature 32 Degrees F, Minimum Relative Humidity Measured Not Applicable, Includes Telescoping Probe, Relative Humidity Accuracy Not Applicable, Temperature Accuracy +/-1.5 Degrees F, Wind Speed Units ft/min, km/hr, knot, m/sec, mph, Air Velocity Resolution 1 fpm EXTECH(R) hot wire thermo-anemometer (Model No. 407123) measures temperature and air speeds in ducts and ventilating systems. Dual-purpose instrument includes 2-ft. probe that extends up to 7-ft. with cable. Auto-off. Features LCD, data hold, and RS-232 interface.