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A watch's case back may be marked "water resistant", together with a static pressure rating and its unit. These markings describe the watch's protection. Before this marking is applied, the model undergoes tests according to the requirements of the international standard ISO 2281.
During laboratory testing, the watch is subjected to static pressure. The most common units are metres (m), bars (BAR) and atmospheres (ATM).
A WR 30 metres marking does not mean that you can dive to a depth of 30 metres with the watch. Although it might remain undamaged for a short time, water may eventually enter the case under such conditions. Similarly, a "water resistant" marking alone does not mean that the watch is suitable for swimming. It indicates protection against brief accidental contact with water, such as when washing your hands.
| Water resistance | Permitted use |
|---|---|
| WR Water Resist Water Resistant |
A watch with this level of water resistance (1 atmosphere) is not suitable for immersion. It is protected only against accidental water droplets. |
| WR 30 Metres WR 100 Feet WR 3 ATM WR 3 BAR WR 30 M |
Protection against accidental splashes or rain. The watch is not suitable for swimming or diving. |
| WR 50 Metres WR 165 Feet WR 5 ATM WR 5 BAR WR 50 M |
Suitable for everyday contact with water, such as washing hands. Swimming is not recommended, and exposure to water should be kept to a minimum. |
| WR 100 Metres WR 330 Feet WR 10 ATM WR 10 BAR WR 100 M |
Suitable for swimming, although diving should still be avoided. |
| WR 200 Metres WR 660 Feet WR 20 ATM WR 20 BAR WR 200 M |
Suitable for water sports, swimming and snorkelling. Diving deeper than 10 metres is not recommended. |
| WR 300 Metres WR 990 Feet WR 30 ATM WR 30 BAR WR 300 M |
Suitable for professional scuba diving. |