I do not believe so. I have mine on a mig welder argon bottle. It works fine, for over a year now. High quality valves are 4 times more expensive.this one works great for my application.

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SPARC Argon CO2 Flow Meter + Welding Gas Regulator for MIG Welding TIG Welding 0-70CFH CGA580 LIFETIME USA WARRANTY

Q: How do you read the scale fro mig mix (75%ar - 25% co2) ??

75/25 is a Argon/C02 mix. It comes premixed when you buy that mixture of gas. All you have to worry about is what your gas flow is coming out of your mig gun. If indoors with no wind or drafts I run 25 to 30 for Mig/Tig. If outdoors with wind I run 40 while trying to shield my weld from the elements as well.