Use these for Argon which all standard flow meters used in the US measure gas in CFH. But the only tool to check what's coming out of the nozzle is measured in LPM. Yes that. Seriously. Why not add an inch scale to the other side of the CFH glass - like my tape measure, yard ruler, mechanic's ruler, kitchen measuring cup, car speedometer, tire gauges, etc. Other than that, it seems to work "fine". "". Difficult to read as the glass is clear and the scale is printed in black, making it difficult to read the numbers. Can I trust LPM readings? How do I check the correctness?!
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