The Dwyer 471B Digital Thermo-Anemometer is a versatile dual-function instrument designed for accurate measurement of air velocity, volumetric flow, and temperature in HVAC, clean air, and ventilation applications. Its rugged yet lightweight extruded aluminum housing protects the electronics while remaining comfortable for extended use during duct traverses and field measurements.

The meter features a high-contrast 4.5-digit LCD that simultaneously displays both selected readings, with a convenient backlight that automatically shuts off after 2.5 minutes to conserve battery life. The stainless steel probe includes a comfortable hand grip and is etched with insertion depth marks from 0 to 8 inches and 0 to 20 cm, ensuring precise positioning within ducts. An integral sliding cover protects the sensors when not in use.

Measurement capabilities include air velocity from 0 to 6000 FPM (0 to 30 m/s) with ±3% FS accuracy, volumetric flow up to 19,999 in selected units, and temperature from -40 to 212°F with ±0.5°F accuracy. Up to 99 readings can be stored in internal memory for later retrieval and analysis. The retractable cable extends to 6 feet for flexible positioning, and a low battery warning ensures reliable operation.

Typical applications include:

• HVAC system balancing and duct traverses
• Cleanroom airflow verification
• Ventilation system commissioning
• Industrial hygiene and environmental monitoring

Features

• Measures air velocity, volumetric flow, and air temperature
• Air velocity range: 0 to 6000 FPM (0 to 30 m/s)
• Temperature range: -40 to 212°F (-40 to 100°C)
• ±3% FS air velocity accuracy
• ±0.5°F temperature accuracy
• Stores up to 99 readings for later retrieval
• 8" stainless steel probe with depth markings
• Retractable cable: 28" retracted, 6' extended
• Backlit 4.5-digit LCD display
• Extruded aluminum housing for durability
• Integral sliding cover protects sensors
• CE approved, 9V battery included