Since the behavior (i.e., degree of saturation) attained by any single pure substance under varying conditions *should* be fairly "algorith-able" (my neologism of the day!), I can't see any real adavntage to carrying the actual substances on each dive, as opposed to virtual analogs of a lot of them :-). As a lover of mechanical gadgetry, however, the old gas-bag&orifice decompression meters (which, as ddoolette pointed out, resembled this concept) were way fascinating. Dave Ventre Quincy, MA
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