  Here we report a robust thermal anemometer which can be easily built. It was
conceived to measure outdoor wind speeds, and for airspeed monitoring in wind
tunnels and other indoor uses. It works at a constant, low temperature of
approximately 90$^\circ$C, so that an independent measurement of the air
temperature is required to give a correct speed reading. Despite the size and
high thermal inertia of the probe, the test results show that this anemometer
is capable of measuring turbulent fluctuations up to ~100 Hz in winds of ~14
m/s, which corresponds to a scale similar to the length of the probe.
