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As others have said Casio G shocks are a safe bet. I've had this bad boy for 5 years, 3 of which were spent firefighting, another year spent constantly getting covered with slightly corrosive dry chemical powder, AFFF, and getting dunked in water constantly. It's been swimming in the ocean and I think you can even dive with it(?)
In any case its had a rough life and is still going strong.
