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To tell whether a watch is suitable for swimming or diving, identify its exact model and read the manufacturer’s guidance for that model. A meter marking alone is not universal permission to use a watch at that depth—or for every water activity. Swimming, snorkelling and scuba diving are separate use cases, and the watch’s current condition matters as much as its original rating.
What a water-resistance marking does—and does not—tell you
A number such as 100 m or 10 bar is not a universal activity chart. It does not, by itself, establish that the watch is suitable for swimming, snorkelling or scuba diving. Interpret the marking using the watch manufacturer’s instructions and any stated standard or diver-watch designation.
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Two ISO standards address different categories. ISO 22810:2010 covers water-resistant watches and their verification. ISO’s listing says this edition was reviewed and confirmed in 2021; the listing also shows a review process in 2026, so that confirmation should not be treated as an unchanging future status. ISO 6425:2018 covers diver’s watches, including saturation-diving watches. Its scope concerns watches designed to withstand water at depths of at least 100 m and equipped with a secured system for measuring diving time that is visible in darkness. ISO says the 2018 edition was reviewed and confirmed in 2024.
In a 3 November 2010 explainer, ISO summarized the distinction this way: “ISO 22810 covers watches intended only for daily use and for swimming, while ISO 6425 covers watches that can be used while scuba diving.” That statement describes the standards’ categories; it does not mean that every watch marked with a particular depth meets the diver-watch standard.
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Match the planned activity to the exact watch
Start with the manufacturer’s activity guidance for your specific model. Charts are not interchangeable: one brand’s recommendation does not establish what another brand permits.
Example: Tissot’s guidance
Tissot’s customer FAQ gives the following recommendations for Tissot watches:
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- 164FT/50M WATERPROOF:Can't wear swimming and taking a hot bath. Because the general watch uses a sealing method to prevent the intrusion of sweat and harmful gases, it is not absolutely not water.only wash hands, shower, Satisfy daily use.NOTE: *Please don't press any buttons under water*
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| Marking | Tissot’s stated activity guidance |
|---|---|
| 3 bar / 30 m | Hand washing |
| 5 bar / 50 m | Hand washing and bathing |
| 10 bar / 100 m | Showering and swimming |
| 20 or 30 bar / 200 or 300 m | Snorkelling and scuba diving |
| 60 bar / 600 m | Professional diving; Tissot identifies this as a diver’s watch according to ISO 6425:2018 |
These are Tissot’s recommendations, not a universal conversion between a depth marking and an activity.
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Example: Timex’s guidance
Timex’s water-resistance chart allows light swimming for its 50 m category and includes recreational scuba diving in its 200 m category. Timex also says not to press buttons underwater unless a watch is indicated as 200 m water-resistant. Follow the instructions for your own model rather than applying Timex’s chart to another brand.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Check whether the watch is still in suitable condition
A rating describes the watch’s stated water resistance; it does not prove the watch’s present condition. Damage, opening, repair or the passage of time can make its current resistance uncertain. If you cannot verify that the watch remains suitable for the planned activity, ask an authorized service provider about a water-resistance check. Tissot recommends annual checks by an authorized service partner; that is Tissot’s recommendation, not a general interval established for every watch.
Quick Recap
Use this checklist before swimming or diving
- Identify the watch. Read the full brand and model reference from the watch or its paperwork, and note the marking on the case or dial.
- Find the official manual. Use the guide for that precise model and follow its activity chart and cautions. Patek Philippe specifically advises owners to consult the relevant watch care recommendations to verify water resistance.
- Match the activity wording. Check separately for swimming, snorkelling, scuba diving or professional diving; do not assume that permission for one includes the others.
- For scuba, look for explicit approval. Check that the manufacturer approves the exact model for scuba use and note any diver-watch designation or ISO 6425 claim. A depth number alone does not establish compliance with that standard.
- Consider service history and condition. If the watch has been damaged, opened or serviced—or you cannot establish its current resistance—contact an authorized service provider before taking it into water.
- Keep controls within the manual’s limits. Do not operate the crown, pushers or other controls underwater unless the exact model’s instructions permit it. Patek Philippe advises against using function controls underwater or when the watch is wet; Timex gives a model-category-specific button warning in its own guidance.
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