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Description： * Multi-functions, mini pocket size, 4 in 1 :
1. Altitude meter, 2. Barometer 3. Anemometer 4. Compass
* Precision baro sensor for the atmosphere value and altitude measurement.
* Low-friction ball bearing mounted wheel design
* Altitude : -2000 to 9000 m, meter/feet.
* Air velocity : 0.4 to 20.0 m/s.
* Air velocity unit : m/s, ft/min., kmh, mph, knot.
* Barometer unit : hPa, mmHg, inHg.
* Size : 120 mm x 45 mm x 20 mm.
* Battery and carrying case are included.