Water Resistant mark
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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
Water Resist marking on the front of the Casio F-91W wristwatch
ISO 6425 compliant DIVER'S 200M marked diving watch
Integrated helium release valve releasing breathing gas from the watch case. This feature is found in some mixed-gas diving watches to prevent the crystal from popping off during decompression.
IP code
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The IP code or Ingress Protection code indicates how well a device is protected against water and dust. It is defined by the International Electrotechnical Commission under the international standard
Water Resistant mark
…since been superseded by ISO 22810:2010, in which "any watch on the market sold as water-resistant must satisfy ISO 22810 – regardless of the brand." IP code Certified chronometer…
IP65 touchscreen display
IP65 LED lamp