Product review (4 stars): ... you can find on amazon and it had the best price. The fan is very smooth and sensitive ...
I believe this comes from the same OEM product you can find on amazon and it had the best price. The fan is very smooth and sensitive enough to measure my sighing breath at 1.3m/s :-) But with only 'mode' and 'set' buttons it could be a bit confusing to figure out all the functionality it offers.