Dwyer Model VT-300 Miniature Vane Thermo-Anemometer


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Dwyer Model VT-300 Miniature Vane Thermo-Anemometer

Telescoping Probe Measures Air Velocity, Air Volume, Temperature, and Humidity


The Model VT-300 Miniature Vane Thermo-Anemometer measures air velocity, air volume, temperature, and humidity inside air ducts. This meter includes a telescoping vane probe that is only 0.7" (18 mm) in diameter that allows duct traverse measurements up to 20" ducts. User-selectable units include ft/min, m/s, knots, mph, and km/hr. The vane probe has a built-in sensor to record temperature in °F or °C, as well as humidity in %RH. There are three modes which include viewing data in real time, manual recording, and automatic recording. Model VT-300 can store measurements that can later be transferred to a PC via RS-232 communication. The vane probe is detachable for easy replacement, if necessary, or as an addition to Model 9671. Each unit is supplied with a hard carrying case, batteries, logging software CD, USB to RS-232 cable and instruction manual.



  • 3-in-1 parameters: Air Velocity/Flow, RH, and Temperature
  • Telescopic probe for traversing ducts up to 20”
  • Built-in data logging for paperless reporting
  • Vane Anemometer offers wider application use vs pitot or hotwire
  • Hard case, Batteries, and software included


Product Applications

  • Building commissioning
  • Building HVAC test and balance
  • Critical environment testing
  • Industrial process verification
  • Instrumentation validation



Range: 98.4 to 3937 ft/min (0.5 to 20 m/s).
Accuracy: ±3% of reading + 0.2 m/s.
Resolution: 0.1 m/s.
Response Time: 1 s.
Range: -4 to 140°F (-20 to 60°C).
Accuracy: ±1°F (±0.6°C) from -4 to 122°F (-20 to 50°C); ±2.2°F (±1.2°C) from 122 to 140°F (50 to 60°C).
Resolution: 0.1°F (0.1°C).
Response Time: 60 s (typ).
Range: 0.1 to 99.9% RH.
Accuracy: ±3% RH at 25°C (10 to 90% RH); ±5% RH (0.1 to 10% RH, 90 to 99.9% RH).
Resolution: 0.1% RH.
Response Time: 60 s (typ).
Range: 0 to 99,999 (CFM or m3/s).
Resolution: 0.1 (0 to 9999.9) or 1 (10,000 to 99,999).
Range: -7.6 to 158°F (-22 to 70°C).
Resolution: 0.1°F (0.1°C).
Temperature Limits: Operating: 32 to 122°F (0 to 50°C); Storage: -4 to 122°F (-20 to 50°C).
Humidity Limits: Operating: <80% RH; Storage: <90% RH.
Display: 1 x 1.8" (26 x 45 mm).
Serial Communications: 9600 bps, 8 data bits, no parity.
Power Requirements: (4) AAA 1.5 V alkaline batteries, included, user replaceable.
Battery Life: 100 hours.
Vane Diameter: 0.7" (18 mm).
Weight: 7.41 oz (210 g).
Agency Approvals: CE.



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    • Dwyer Model VT-300 Miniature Vane Thermo-Anemometer
    • Dwyer Model VT-300 Miniature Vane Thermo-Anemometer