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We have a flow indicator on the output from the regulator, something like these:
Single Stage Argon Flow Gas CO2 Flowmeter Weld Welding Regulator | eBay
Argon Gas Flowmeter 0-14 LPM TIG/MIG Welding Flow Meter | eBay
You can check ACTUAL flow rates rather than guessing.
Peter
you can also get the cheap peashooter ones