Check the listing for details. EXTECH AN340 Anemometer, 100 to 3,940fpm, -4 to 140F 43Y057. Condition: New. Listed at 636.97 USD. Anemometer, Minimum Velocity Measured 100 fpm, Probe Diameter 0.7 in, Probe Type Rotating Vane, Maximum Velocity Measured 3,940 fpm, Minimum Dew Point Measured -4 Degrees F, Minimum Hot Wire Probe Length 14 in, Minimum Operating Temperature -4 Degrees F, Minimum Relative Humidity Measured 0.1 Percent, Includes Carrying Case, Mini Vane Probe, USB Cable, Relative Humidity Accuracy +/-3 Percent, Temperature Accuracy +/-1.1 Degrees F, Wind Speed Units ft/min, m/sec, Air Velocity Resolution 1 fpm The Extech(R) CMM anemometer/psychrometer datalogger (AN340) measures air velocity, air volume, temperature, humidity, wet bulb, and dew point. A telescoping probe with 18mm diameter vane sensor easily fits into air vents and can extend the length of probe to 3.3 ft. (1m). Stores up to 12,000 readings.