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Yes, a watch or a compass, or a cell-phone would have to be hermetically sealed very well in order to survive everyday pressure changes such as aircraft flight, weather pressure cycles and so on.
A well-designed mechanism may incorporate a small air bladder to absorb these changes, but no simple apparatus will do so.
When the air enters the device, due to pressure changes say, it will carry with it some water vapour, and regrettably, this will condense into liquid water when some part of the device gets cool. And it is not simple for this water to evaporate again.
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Movement
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here go to this link and watch the video. I had that same problem and it worked for me :D
