Welcome to ProCooling!
I've been looking at many flowmeters over the past couple of months, and received some specs too.
First, I have to point out that the more accurate they are, the more expensive they are!
I have yet to find a nice inexpensive, unobstructive flow meter with some (any!) kind of electrical (or electronic) readout, but if I come across one, you'll be the first to know!
I've also been looking into "flow sensors", something to tell me if there is flow or not, that generates a signal that could be used to shutdown the PC. No cheap luck there either.
So the first thing you want to do is determine the purpose, and a budget!
BTW, flow meters that have a visual sight are common and cheap.
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