Anemometer Vane Type, 0.4 to 30m/s, ft/min, Km/h

See data sheet here

FEATURES
* The portable anemometer provides fast accurate readings with digital readability and the convenience of a remote sensor separately.
* Multi-functions for air flow measurement: m/s, km/h, ft/min, knots.
* Low-friction ball-bearing design resulting in accuracy at both high and low velocities.
* Conventional twisted vane arms, always a source of unreliability have been eliminated.
* DATA HOLD.
* Compact housing cabinate.
* Wide applications: use this anemometer to check air conditioning & heating systems, measure air velocities, wind speeds, temperature…etc.