According to MetOne (http://www.metone.com)....
The AIO 2 Weather Sensor provides measurements of wind speed, wind
direction, ambient air temperature, relative humidity, and barometric
pressure in a single, compact, rugged unit. It integrates a folded-path,
low-power sonic anemometer with a precision thermistor temperature
sensor, fast-response capacitive relative humidity sensor, and a
state-of-the-art barometric pressure sensor. It also includes an
internal flux-gate compass that allows for automatic alignment of wind
direction to magnetic north, regardless of the sensors orientation.
The small footprint and power efficiency of the AIO 2 make it ideal for
remote regions, urban environments, air quality networks,
construction/remediation sites, and other network applications. The unit
can be used in permanent (cooperative weather networks, schools, public
information dissemination) or temporary (emergency response, audit,
research program support) installations.
MetOne_AIO2_Manual.pdf
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