More information about how an anemometer works in this link.
The HHF802 air velocity meter is an economical
solution for any air flow application,
such as, air conditioning and
heating systems, wind speeds,
balancing, and environmental
testing. The portable HHF802
provides fast, accurate readings
with digital readability and the
convenience of a remote probe.
The combination of low friction
vane anemometer and standard
thermistor delivers rapid and precise
measurements. The microprocessor
circuit assures the maximum
possible accuracy and provides
special functions and features.
† All amounts shown in EUR, GBP, or USD Note: Comes with complete operators manual, hard carrying case and 9V battery