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Hi there @gnoks. Great to see you in the Community! 🙂
In the product manual, it just specifies the operating temperature which as you stated, it should be 14° to 113° F (-10° to 45° C) but doesn't say anything about humidity. I don't think this will cause any problem as I have been using mine this way. I take it off while showering and the room gets very steamy as well but this hasn't caused my tracker any problem at all so I would expect you not to have it either.
Any other question you may have, let me know and I'll be glad to help!
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Best Answercan't we check with fitbit's engineer's what the recommended operating humidity range is? would be good to know?
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