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slim_boy_fat
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Odd that it's got 'sectors' for Tig/Mig, surely you wouldn't waste pure argon on migging? 
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Most folk just call me; Orange Joe
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If you want to be pedantic, you have to use pure argon for MIG, any percentage of CO2 or oxygen and you're MAG welding, but it's not a distinction anyone really seems to care about.Odd that it's got 'sectors' for Tig/Mig, surely you wouldn't waste pure argon on migging?
I suspect the guage is actually marked like that so they don't have to produce two different ones for argon and Argoshield though.
Why do you need to know who made the gauge?
slim_boy_fat
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I stand corrected, schooldays and all that. 
Is that an actual brand, the pressure (flow) gauge accuracy grade, or a brand that is designed to be mistaken for the accuracy grade?
Jack
googled 'tig mig gauge iso 5171 1a' and searched through images...
www.manomano.co.uk
SWP Side Entry Single Stage 2 Gauge Argon/CO2 Regulator 35LTR/MIN
IN STOCK: best prices on SWP Side Entry Single Stage 2 Gauge Argon/CO2 Regulator 35LTR/MIN, ZT1000036X.
www.manomano.co.uk
Agroshield
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What you show is not strictly a pressure gauge. If it were a true pressure gauge, it would be graduated in units of pressure. It is graduated in litres per minute, which are units of flow. The scale that is on it is non-linear: from zero to 30 is not half of zero to 60. It will be specially made to go with a regulator and is unlikely to be available as a separate spare part. To achieve the same (actually considerably better*) functionality, you can remove it, determine the thread on it, buy a blanking plug to block the hole and replace it with a proper argon flow meter (e.g. https://www.weldingsuppliesdirect.co.uk/flow-meter-0-15-lpm.html). Choose the one to suit the process - 0-15lpm for TIG, 0-40 lpm for MIG.
* Look at what percentage full scale deflection the TIG part covers - it is hardly high resolution or finely graduated. Compare with a proper flow gauge which you can easily adjust in increments of 1 litre per minute
Yes, it is a flow gauge, not a pressure gauge. That type of gauge has a fixed orifice that is used in conjunction with the pressure you set to adjust the required flow. Personally, I would replace the entire regulator-flow gauge with a regulator-flowmeter. As @Argoshield said, it will be much more easily adjusted. Try to find one calibrated at 20 to 25 psi - it will produce less gas surge.
Jack
