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i think you gonna find both those gauges are pressure, not flow. most flow indicators are long tall ball in a tube deal use whatever gives good weld outdoors in wind, needs more gas

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Wrong, the gauge on the left is flow, CHF. My miller has the same exact setup.

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My first impression was it was a pressure gauge, and others were confusing to me commenting on flow, it was difficult for me to make out the markings, but I assume those that can see it are reading cfm, and yes, proper flow is of course only measured in CFM. Has it been mentioned yet that too much flow can have a downside by sucking small amounts of air?