As we pointed out, you can get them cheap on eBay. The trick is to check how accurate they really are. The best way would be to find someone who can test it for you.
Otherwise, I have to say that I'm concerned that you might not be able to repeat the same airflow each time, but that assumes that the fans are going to go through some wear and tear. Maybe you'd be able to at least measure the voltage feeding them?
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