The TA642 Series High Accuracy Digital Anemometer is a professional handheld air velocity and airflow measurement instrument designed for accurate measurement of air speed, air volume and ambient temperature. The series includes integrated models TA642A and TA642B, as well as the split probe model TA642C, providing flexible solutions for different testing environments. Equipped with a high-performance infrared waveguide sensor, the TA642 Digital Anemometer delivers fast response, stable readings and reliable measurement performance. It is widely used in HVAC systems, air conditioning duct testing, ventilation system commissioning, cleanroom airflow inspection, industrial ventilation monitoring, exhaust systems, building engineering acceptance and environmental testing. The instrument supports multiple air velocity and airflow units, with customizable duct cross-sectional area settings for automatic airflow calculation. It is suitable for measuring airflow in round ducts, rectangular ducts and various ventilation systems. The TA642B and TA642C models feature built-in data logging and USB communication functions, allowing connection with a computer for real-time data acquisition, historical data export, measurement curve analysis and report generation, making testing records easier to manage and trace. With practical functions including data hold, MAX/MIN recording, high/low alarm settings, automatic power-off and low battery indication, the compact and portable TA642 Series Air Velocity Meter is an ideal solution for HVAC professionals, engineers, technicians, manufacturers, laboratories and educational institutions.