Casio GB-6900B User's Manual For Watch Functions page 63

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A trained technician will know how to check your watch for proper water resistance
whenever you have its battery replaced. Battery replacement requires the use of
special tools. Always request battery replacement from your original retailer or from
an authorized CASIO Service Center.
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Some water-resistant watches come with fashionable leather bands. Avoid
swimming, washing, or any other activity that causes direct exposure of a leather
band to water.
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The inside surface of the watch glass may fog when the watch is exposed to a
sudden drop in temperature. No problem is indicated if the fogging clears up
relatively quickly. If the fogging does not clear or if water has gotten into the watch,
take it in for repair immediately.
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Continued use of the watch with water inside can result in damage to electronic
and mechanical components, the face of the watch, etc.
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Your water-resistant watch has been tested in accordance with the International
Organization for Standardization regulations ISO2281 and FTC (USA) "GUIDE FOR
THE WATCH INDUSTRY." Guide 5.
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