Dwyer Model 471B-1 Thermo-Anemometer Test Instrument


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Dwyer Model 471B-1 Thermo-Anemometer Test Instrument

Digital Thermo-Anemometer, 9v Battery, Probe, Wrist Strap, Soft Carry Case

Measures Air Velocity or Air Volume and Temperature Simultaneously

The MODEL 471B Thermo-Anemometer Test Instrument is a versatile dual function unit that quickly and easily measures air velocity or volumetric flow as well as air temperature in imperial or metric units. A stainless steel probe is included, which has a comfortable hand grip and etched insertion depth marks. The extruded aluminum housing fully protects electronics, yet is lightweight and comfortable to hold.

Product Applications

  • Duct traverses
  • HVAC inspections
  • Testing and balancing


Air velocity and temperature of clean, dry air.
Temperature Limits:
Process Air Velocity: -20 to 212°F (-29 to 100°C); Process Temperature: -40 to 212°F (-40 to 100°C); Ambient: 5 to 125°F (-15 to 51°C).
4.5 digit LCD.
0.1%, 0.1°F/°C.
Range Air Velocity:
0 to 6000 FPM (0 to 30 m/s).
Accuracy Air Velocity:
±3% FS within temperature range of 40 to 90°F (4 to 32°C).
Range Volumetric Air Flow:
19,999 in selected flow units.
Range Temperature:
-40 to 212°F (-40 to 100°C).
Accuracy Temperature:
±0.5°F (±0.28°C) from 32 to 122°F (0 to 50 °C); ±1.5°F (±0.83°C) from -40°F to 32°F (-40 to 0°C) & 122 to 212°F (50 to 100°C).
Probe Length:
8" (203 mm) insertion.
Cable Length:
28" (71 cm) retracted, 6 ft (183 cm) extended.
Power Requirements:
9 V alkaline battery, installed non-functional, user replaceable.
16 oz (454 g).
Agency Approvals:


  • High contrast and backlit LCD for visibility in any condition
  • Able to store up to 99 readings
  • Integral sliding cover protects probe sensors when not in use
  • Built-in volumetric air flow calculations

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  • Dwyer Model 471B-1 Thermo-Anemometer Test Instrument