HeinrichsWeikamp

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HeinrichsWeikamp, based in Germany, is a company that produces sports precision instruments for scuba diving including personal dive computers and oxygen partial pressure monitors for diving rebreathers.^[1]

Their products: OSTC, OSTC Mk.2, OSTC 2N, OSTC3, OSTC4 and Frog are supported by Subsurface, free software for logging dives authored by Linus Torvalds.