frank, we teach all that and more in our iantd nitrox courses... and we test em on it, and if they don't pass they don't dive it sir... it's easy, we live in a technical world now, the average diver that's interested in n2o2 has a pretty good education level.. not like the divers of days gone by. one agency's manuals are on an eight grade level, maybe ten or twenty years ago maybe. dennis
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