What does the water resistance on a watch mean?

Most watches are equipped with some level of water resistance but the extent of this will vary depending on the model. Some watches will specify the water resistance on the dial or case back, while others will inform you in the manual.

The water resistance is usually displayed in terms of metres, but it is useful to note that this is in terms of pressure rather than the depth of water.

30 metres (3 ATM) is splash proof and protected against accidental exposure to water.
50 metres (5 ATM) can be submerged in water and used for swimming.
100 metres (10 ATM) suitable for swimming and shallow diving
200 metres (20 ATM) suitable for non-deep sea diving.
500 metres (50 ATM) can be used for deep sea diving.

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