Did a search on it, it's fairly well known that it exists ... but most people, like us, are like WTF? How does it work.
However it works, my bet is that with the latest hardware and electronics a smart person could produce one for a fraction of the cost. I have zero facts ... but the design looks kind of dated.
It's got to work on the principle that a known volume of air of ANY shape, well behave in a certain way, at certain temps.
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