Shocks:
Your watch is a precision measuring instrument. Treat it carefully, and
it will serve you well. Avoid undue shocks (such as dropping on hard
surfaces). The normal shocks caused by sports like tennis or golf
present no threat, but “Twin Seiko” (extra-high precision) watches
should not be worn while participating in such sports.
Perspiration: You should aim to protect your watch from heavy
perspiration. Please remember to wipe it dry as soon as conveniently
possible.
Temperature Extremes: Quartz watches are much less affected by extremes
of temperature than mechanical watches, and are designed to keep good
time if worn on the wrist for eight hours a day with ambient
temperatures between -10°C and +35°C. If removed completely from the
wrist, your watch may lose time during the winter, but will return to
normal accuracy as soon as you start wearing it again.
If your watch is stored at temperatures outside the normal range (as low
as -10°C or as high as +60°C) the electronic components may cease to
function normally.
The response time of liquid crystals used in the displays on digital
watches at temperatures below freezing is slow, and they tend to look
very dark at high temperatures, but normal performance returns at normal
temperatures.
Battery life can be significantly reduced at high temperatures (above 40°C), and battery fluid may even leak out.
Chemicals: Chemical substances, gases, mercury, etc., may change the
color of cases, bracelets and straps. Mercury (for instance, from a
broken thermometer) can cause particularly unsightly grey discoloration
of gold plating.