Comfort levels - outdoors. The General Mini Airflow Meter is fitted with an impeller and with sensors which allow it to carry out measurements in the open air. It will give you all the information essential for your open air activities such as hang-gliding, rambling, climbing or water sports. It will give you the instant wind speed and the maximum wind speed (DAF3010, 3300, 4000), ambient temperature and wind chill temperature (3010, 3300, 4000), an electronic compass (DAF3300, 4000) as well as altitude, pressure, and rends in the weather (DAF4000). The General Mini Airflow Meter range has been designed to withstand short-term immersion in water at a depth of up to one meter.