The Extech AN300 is a professional-grade thermo-anemometer featuring a 4-inch (10 cm) large vane designed for accurate airflow measurements on larger duct systems. The oversized vane provides improved accuracy by capturing more representative air samples across the duct cross-section, making it ideal for HVAC commissioning, balancing, and troubleshooting.

The meter simultaneously displays air velocity (or airflow in CFM/CMM) and temperature on a clear LCD. A built-in thermistor provides precise air temperature readings from -4°F to 140°F. For advanced analysis, the AN300 offers multipoint and timed average calculations, allowing users to characterize variable airflow patterns. Min/Max recording and Data Hold functions simplify field documentation.

Select models expand capability to include humidity and carbon dioxide (CO2) measurement, providing a comprehensive indoor air quality assessment tool. The AN300 is suitable for a wide range of applications including HVAC system verification, manufacturing process monitoring, engineering R&D, and appliance testing.

Built for reliable field use, the instrument includes auto power off to conserve battery life and is backed by Extech's reputation for quality test equipment.

Features

• 4" (10 cm) large vane for improved accuracy on larger ducts
• Simultaneous display of airflow/air velocity and temperature
• Airflow range: 0 to 99,999 CFM/CMM
• Temperature range: -4°F to 140°F (-20°C to 60°C)
• Accuracy: ±1.5%
• Multipoint and timed average calculations
• Min/Max recording and Data Hold
• Optional models with humidity and CO2 measurement
• Auto power off
• Ideal for HVAC, manufacturing, engineering, and R&D applications