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, DATA HOLD function for stored the desired value on display. Large LCD display, easy to read., * Low-friction ball-bearing design allows free vane movement, resulting in accuracy at both high & low velocities, Built-in low battery indicator, Wide applications: use this anemometer to check air conditioning & heating systems, measure air velocities, wind speeds, temperature