The Dwyer 473B-1 vane thermo-anemometer is a portable, handheld solution designed for measuring key air parameters in clean, dry air environments. It integrates air velocity, volumetric flow, air temperature, and humidity measurement into one unit, paired with a stainless steel 100mm vane probe (included) for reliable data collection. The 8-inch probe is complemented by a retractable cable—28 inches when collapsed, extendable up to 6 feet—allowing easy access to hard-to-reach vents or ducts during inspections. This design makes the 473B-1 an ideal tool for residential HVAC balancing and professional HVAC inspection tasks.

The 473B-1 delivers precise measurements across critical ranges: process temperatures from -20 to 212°F (-29 to 100°C), relative humidity from 0 to 100% RH, air velocity from 40 to 5000 fpm (0.2 to 25 m/s), and volumetric air flow up to 19,999 (in user-selected flow units). Its 4.5-digit backlit display ensures clear readability even in low-light environments (e.g., mechanical rooms), providing real-time data at a glance. Additionally, the unit can store up to 99 readings, enabling users to capture data during inspections and review it later—eliminating the need for manual note-taking.

Features

• Multi-parameter measurement: Air velocity, volumetric flow, air temperature, and relative humidity—all in one handheld unit (for clean, dry air only)
• Wide measurement ranges to cover residential and HVAC inspection needs:
  • Air Velocity: 40 to 5000 fpm (0.2 to 25 m/s)
  • Volumetric Air Flow: Up to 19,999 (in selected flow units)
  • Temperature: -20 to 212°F (-29 to 100°C)
  • Relative Humidity: 0 to 100% RH
• 8 in. (203mm) stainless steel vane probe: Durable, corrosion-resistant, and optimized for accurate air velocity detection
• Flexible retractable cable: 28 in. when retracted (for compact storage) and 6 ft. when extended (for reaching distant or high vents)
• 4.5 digit backlit display: Ensures readability in low-light conditions, with clear real-time data presentation
• Data storage capacity: Stores up to 99 readings, allowing for later evaluation and documentation of inspection results
• 9 V alkaline battery power: Easy to replace, ensuring continuous use during on-site inspections without frequent charging
• Compact handheld design: Lightweight and portable, reducing user fatigue during extended inspection sessions
• Tailored for residential HVAC balancing: Precisely adjusts air flow in homes to optimize comfort and energy efficiency