The TA641B Digital Anemometer is a professional handheld airflow measurement instrument, also known as a portable anemometer, air velocity meter, wind speed meter, airflow tester, or wind temperature and humidity meter. Equipped with a precision vane sensor, it provides fast and accurate air velocity measurement while simultaneously monitoring air temperature and ambient humidity for comprehensive environmental analysis. Supporting multiple selectable wind speed units including m/s, km/h, ft/min, mile/h, and knots, the digital anemometer features practical functions such as data hold, maximum/minimum/average value recording, high/low alarm settings, and backlit display. Its compact and lightweight design makes it suitable for field inspections, HVAC commissioning, ventilation system testing, industrial maintenance, and environmental monitoring applications. The TA641 Series Digital Anemometer is widely used in HVAC systems, building ventilation inspection, air conditioning maintenance, industrial manufacturing, power plants, steel and metallurgy industries, petrochemical facilities, aerospace applications, fan manufacturers, underground spaces, warehouses, laboratories, cleanrooms, weather observation, and outdoor environmental testing. It is ideal for applications such as duct airflow measurement, ventilation performance evaluation, fan testing, air circulation analysis, air quality assessment, and airflow monitoring in both indoor and outdoor environments.