Dwyer Series 471 Digital Thermo-Anemometer – Accurate Air Velocity & Temperature Meter

This is a Dwyer Series 471 digital thermo-anemometer, a high-quality dual-function instrument that measures air velocity (in feet per minute or meters per second) and air temperature (°F / °C). Ideal for HVAC, duct traverses, air-balancing work, and industrial airflow measurements.

✅ Key Features & Specifications

• Air Velocity Ranges (field selectable):

  • 0–500 FPM

  • 0–1,500 FPM

  • 0–5,000 FPM

  • 0–15,000 FPM 

• Velocity Accuracy:

  • ±3% FS for lower ranges, higher range has ±4% / ±5% depending on setting. 

• Temperature Range: 0 to 200 °F (–18 to 100 °C). 

• Temperature Accuracy: ±2 °F (±1 °C) for the 471‑1 model. 

• Display: 4.5‑digit LCD; backlit screen for visibility in low light. 

• Response Time: ~15 seconds for velocity; 30 seconds for temperature.

• Power: 9 V alkaline battery (included in many versions). 

• Probe:

  • 471‑1: 10″ (25.4 cm) stainless steel hand‑grip probe. 

  • 471‑2 / 471‑3: telescoping probes (up to 33″ / 83 cm). 

• Housing: Extruded aluminum — rugged but lightweight. 

• Accessories (standard): 9V battery, wrist strap, step‑drill for duct holes (3/16″ to 1/2″), carrying case, instructions.