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Calculating your gas content when diving nitrox is the cardinal rule. Not writing it down so others can see it is breaking the safe nitrox diver's rules. Never dive nitrox without this important slate. It can save a divers life in the remote chance they suffer from decompression sickness (DCS). The content of your breathing gas will allow medical personnel know the best and most proper treatment to assure a fast and permanent recover if DCS occurs. Slate is manufactured from strong and impact resistant material and has a slide loop fastener to snitch it up and out of the way when diving.