The Airflow™ Instruments Velocity Meter TA500 is a portable, handheld Multi-Function Ventilation and IAQ test instrument featuring a menu-driven user interface for easy operation. The high-resolution color screen displays multiple measurements simultaneously in real-time with on-screen prompts to guide you through instrument setup and operation.

The Airflow™ Instruments Velocity Meter TA500 is designed to work with a wide range of plug-in probes for measuring air velocity, temperature, relative humidity, CO and CO₂. Its ergonomic design includes a probe holder and integrated magnets allowing for attachment to exposed ductwork or other metallic surfaces for hands-free operation. The Model TA500 includes a built-in workflow for calculating the percentage of outside air used to determine ventilation effectiveness in a building or room when used with an IAQ probe.