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I have an F-91W that I've modded ... by filling it up with olive oil with the purpose of making it water resistant to 1500?! meters. It is so cheap that I can wear it and not worry about destroying it.

I haven't seen this mod before. I'd be all over it if it offered a Python interface.

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Why olive oil? Doesn’t that change the color slightly? Wouldn’t mineral or silicon oil work just as well without a color shift?

You can’t flavor your emergency pizza or pasta with these.

I didn't have any mineral oil handy. It probably changed the color but it is already LED greenish.

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