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To be honest, neither do I. In fact, I don't always do that on my nitrox tanks either. Mix and fill date are mandatory, MOD only if I'm on the anal side of adhering to procedure when I do the fill. Pressure is totally meaningless; it varies by tens of bars depending on tank temp. It is what it is when I assemble my rig, and it is what it is when I've paddled out from the shore and am ready to vent my wing. I check the content anyways when I'm assembling the rig and I'm quite competent to check the MOD when I'm planning my dive, thankyouverymuch.I don't mark the MOD on my air tanks.
Wild guess: It's either alcohol or stupidity.is this just another of your silly posts?