Citizen J250 Instruction Manual page 31

Water depth measurement
When fog appears inside the watch's glass or water enters the watch
If the inside of the watch fogs up for a long time or sea water enters it, put it in a
box or plastic bag and immediately consult your nearest authorized Citizen service
center for repair.
• Otherwise, pressure inside the watch will increase and parts (crystal, crown, push
button, etc) may come off.
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