Casio G-Shock GSW-H1000 User Manual page 117

Temperature
Never leave your watch on the dashboard of a car, near a heater, or in any
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other location that is subject to very high temperatures. Do not leave your
watch where it will be exposed to very low temperatures. Doing so can
cause malfunction.
Leaving your watch in an area hotter than +60°C (140°F) for long periods
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can lead to problems with its display panel. The display panel may become
difficult to read at temperatures lower than 0°C (32°F) and greater than
+40°C (104°F). Watch operation that is stopped due to high temperatures
will not resume until the watch cools sufficiently. Wait for a while to allow
the watch to cool.
Use in Cold Environments
Under cold conditions, the operating time provided by a battery is shorter
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than normal, even if the battery is fully charged.
Extreme cold can cause Wi-Fi operation to shut down automatically to
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protect the watch's system.
Magnetism
Some watch functions may not operate normally in a location where
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magnetism is present. Very strong magnetism (from medical equipment,
etc.) should be avoided because it can cause malfunction of your watch
and damage to electronic components.
Chemicals
Do not allow your watch to come into contact with thinner, gasoline,
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solvents, oils, or fats, or with any cleaners, adhesives, paints, medicines,
or cosmetics that contain such ingredients. Contact with such agents can
cause discoloration of or damage to the resin case, resin band and other
parts.
Sunblock, hand cream, cosmetics, and other applications coming into
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contact with the back cover of the watch can soil the sensor window, which
can decrease heart rate accuracy. Avoid use of such skin applications when
performing heart rate measurement.
EN-116