Water Resistant water resistant is a common mark stamped on the back of wrist watches to indicate how well a watch is sealed against the ingress of water. It is usually accompanied by an indication of the static test pressure that a sample of newly manufactured watches were exposed to in a leakage test. The test pressure can be indicated either directly in units ofpressure such as bar (which is neither an SI nor an cgs unit, but is accepted for use[1] and used by the International Organization for Standardization), atmospheres, or (more commonly) as an equivalent water depth in metres (in the United States sometimes also in feet).
An indication of the test pressure in terms of water
depth does not mean a water resistant watch was designed for repeated long-term
use in such water depths. For example, a watch marked 30 metres water resistant
cannot be expected to withstand activity for longer time periods in a swimming
pool, let alone continue to function at 30 metres under water. This is because
the test is conducted only once using static pressure on a sample of newly
manufactured watches. The test for qualifying a diving watch for
repeated usage in a given depth includes safety margins to take factors into
account like aging of the seals, the properties of water and seawater,
rapidly changing water pressure and temperature.
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