The Dwyer wind meters with white pith ball were always stuck, at least here in Florida with its humidity. The Hall wind meter with red plastic disc works much better.
A propeller type ASI can be quite accurate if the propeller is properly designed but it indicates true airspeed rather than density based airspeed; a propeller is a screw, turning the same number of revolutions/mile whether in air, water or soft snow.
Flying machines don’t care about true airspeed; they perform in accordance with density airspeed.
Oops! I should have said a propeller is a nut rather than a screw.