I have a suggestion for your dive computer. In addition to measuring pressure like a lot of integrated units do, incorporate an oxygen sensor into the high pressure port tap. Then you can do calculations for Nitrox. If the unit were set up on a manifold so that all gases were routed through it, you could even handle changes in breathing mixture (air for deep, nitrox or oxygen or a combination for deco). There are a lot of oxygen sensors on the market for medical or automotive use so that may be do-able at a reasonable price. Rick Fincher rnf@sp*.tb*.co*
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