I apoligize for coming into this thread late, but...
That Blue White flowmeter is a poor example of what is available on the market. Just because it's cheap doesn't imply it is suitable for your use. As for history, I have personally removed ~30 Blue White (Orange is another name to stay away from) flowmeters in the last 4 years due to breakage and warpage. If you trully want accuracy as well as low/no pressure drop you need to spend/borrow/steal a magnetic flowmeter, with a nominal size equal to your tubing ID. THere are quite a few available, just be patient.
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