Thanks Zymrgy, but those have a high pressure drop, and in a cooling loop, with our poor little centrifugal pumps, we need all the pressure we can get!
I have a rotameter type flowmeter, similar to the one you displayed, and it's not too bad, with a claimed 5% error margin.
It's been suggested to wait for a magnetic one to appear on Ebay, but all in all, we're passed giving a practical, and available solution to the DIY block maker.
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