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W

Water Resistant

Watches have varying degrees of water resistancy, ranging from WR30 Meters to some specialist watches having a capability of withstanding water to 10000 Meters. The usual for a diver's watch is 200m whilst 100m would be suitable for everyday swimming.

Made to prevent water from entering. Water-resistant case, watch-case whose joints are made to prevent moisture from entering.
To 30m, means the watch is splashproof
To 50m, means the watch will withstand swimming(not diving)
To 100m, means the watch will withstand snorkelling and diving into a pool (not scuba diving)
200m, means it is a professional diving watch, including scuba diving