Water resistance is the watch case’s ability to prevent the water from entering inside the watch.
Water Resist has replaced the now obsolete term of Waterproof, as the latter is very absolute and does not properly identify the pressure a watch can be exposed to.
The term Water Resist (WR) is followed by a number indicating the pressure a watch case can sustain. This number, according to the manufacturer’s choice, can be either in Metres (m), Feet (ft), Bars or Atmospheres (ATM).
The units of meters and feet indicated, are a pressure rating and NOT the recommended depth of use.
These ratings take into account the combination between motion and depth.
Since a watch is not static when worn on the wrist, pressure applied to a watch dramatically increases with motion.
In this respect, if you dive in a pool to a depth of 2.5 metres the pressure a watch will be sustained to will not be 0.25 atmospheres.
Below is the definition for the water-resistance categories. Use your watch accordingly.
Note that one atmosphere (ATM) or Bar of pressure, is equivalent to the pressure exerted on a static object lying in a depth of 10 metres. Pressure multiplies with motion.
WATER RESISTANT 30m: The watch is safe for accidental contact with splashes of water.
WATER RESISTANT 50m: Suitable for swimming on the surface of the sea.
WATER RESISTANT 100m: Can be used for snorkeling.
WATER RESISTANT 200m and more: Suitable for scuba diving.
Water Resistance protection is not a permanent state and a watch needs periodical maintenance by replacing all rubber seals, followed by a water resistance test to ensure the watch's impermeability to water.
In order to preserve the watch’s water resistance:
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