Casio WSD-F10 User Manual page 127

Premature Wear
Leaving sweat or water on a resin band or bezel, or storing your watch in
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an area subject to high moisture can lead to premature wear, cuts, and
breaks.
Skin Irritation
Individuals with sensitive skin or in poor physical condition may experience
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skin irritation when wearing a watch. Such individuals should keep their
leather band or resin band particularly clean. Should you ever experience
a rash or other skin irritation, immediately remove your watch and contact
a skin care professional.
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