JJG 1194-2023 "Impeller Digital Anemometer" is suitable for the first verification, subsequent verification and inspection in use of wind speed instruments with a Measurement range of 2 m/s to 40 m/s. This procedure refers to relevant standards such as lightweight three-cup wind direction anemometer and hygienic inspection methods in public places. The terminology section defines key concepts such as impeller digital Anemometer, starting wind speed, blocking ratio, wind speed uniformity and wind speed Stability. The Anemometer consists of impeller wind speed Sensors and digital display instruments. It is mainly used for accurate measurement of air flow velocity and output the results in digital form. It is suitable for various environments and applications that require wind speed measurement.