I had four scuba air cylinders and two deco (50% and 100% O2) cylinders hydro tested and cleaned and filled with their correct gases a few days ago, and picked them up this morning, however the shop was closed so they left them for me in their cleaning shed, get them home (90 minutes away), analyse the gas mixtures and find the pure O2 to be 80 and the 50% to be 40%. This really grinds my gears.

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Air is for pussies.