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  • 8904
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  • Air Velocity
    • Range: 80 to 5900 ft/min (0.4 to 30 m/s)
    • Accuracy: ±3% of reading or last significant digit (whichever is greater)
    • Resolution: 1 ft/min (0.01 m/s)
    • Response Time: 1 second
  • Temperature
    • Range: 14 to 122°F (-10 to 50°C)
    • Accuracy: ±1°F (±0.6°C)
    • Resolution: 0.1°F/°C
    • Response Time: 60 seconds
  • Serial Communications: 2400 bps, 8 data bits
  • 1.3” LCD display
  • 9V alkaline battery, user replaceable
  • Battery Life: 100 hours
  • 2-7/8" vane
  • CE approved

What's in the Box

  • Hard carrying case
  • 9V alkaline battery
  • Instruction manual


The Dwyer 8904 integral vane thermo-anemometer simultaneously measures air velocity and temperature. A large 1.3" LCD display allows users to easily view readings. Wind speed can be measured in user-selectable wind speed units including: ft/min, m/sec, knots, mph and km/hr. Additionally, a built-in sensor records ambient temperature in °F or °C. The 8904 features include data hold, the ability to record minimum, maximum and average readings on a single point and an RS-232 interface setting. The units can also record and average up to 2 hours of data while displaying the continuous running average. This compact meter is ideal for HVAC inspection, energy audits and balancing applications.