The TA646A Digital Anemometer is a professional handheld air velocity measurement instrument integrating airflow speed and ambient temperature measurement. It is also known as an air velocity meter, wind speed meter, airflow tester, ventilation tester, or portable airflow measurement device. Equipped with a high-sensitivity infrared laser-cut sensor, the instrument provides fast and accurate measurement of air velocity and temperature in various airflow environments. The TA646A supports multiple wind speed units and features practical functions including data hold, maximum/minimum value recording, and backlight display, offering convenient operation, reliable performance, and excellent portability for field applications. The TA646A Digital Anemometer is widely used in HVAC system commissioning, air conditioning outlet testing, ventilation duct inspection, fresh air system evaluation, fan and blower performance testing, industrial workshop airflow monitoring, power plant ventilation inspection, petrochemical facility safety monitoring, steel and metallurgy production environments, aviation airflow measurement, outdoor weather observation, building engineering acceptance, underground space ventilation assessment, and warehouse air circulation testing. With its compact design, accurate measurement capability, and versatile functions, the TA646A Digital Anemometer is an ideal airflow measurement solution for HVAC engineers, maintenance technicians, industrial inspectors, facility managers, and professionals requiring reliable air velocity and temperature testing in field environments.