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,