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Huma air regulator ???

Just remember, it is a sticker with pre-measured increments. I'm sure they apply that sticker to the reg to match a specific output. Just an example, but if they test/adjust a reg to 120bar than that's where they align the 120 mark on the sticker when it goes on... Its all mechanical so there will be variations and that variance could easily increase the further you get from what ever they used as a starting point. Still, mine have been pretty dang close.