DETOMASO SAN REMO Manuel D'instructions page 15

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Waterproof properties
The water resistance of your DETOMASO watch has been tested
to be 30 ATM.
This means that it is splashproof and that you may wash your
hands or take a bath or a shower with it. You may also swim with
it and even go diving. Waterproofness is not a permanent charac-
teristic; it should be tested annually and in particular before the
watch is put under exceptional strain, as the seals deteriorate
gradually in daily use. The seals are the important factor in gua-
ranteeing the waterproofness of a watch. These age naturally and
are also affected by perspiration and acids.
ISO 2281 stipulates which standards have to be met by a new
watch. The level of waterproofness is given in atm and noted on
the base of the casing. Your DETOMASO watch has been tested
and has a water resistance of 30 ATM. The specification „30
ATM" is not to be confused with the diving depth; it is simply the
definition of the inspection pressure. An inspection pressure of
30 ATM is reached at a depth of 300 m.
In some cases a short-term higher pressure than the guaranteed
inspection pressure may be enforced on the seals, for example
when swimming or diving into water. Watches are at particular
risk when the wearer dives into water after sunbathing. The
combination of the impact pressure with the negative pressure
caused by the sudden drop in temperature can quite easily cause
damage.
It is important to check and, if necessary, replace seals when the
battery is replaced.
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