Water Resisting Rating
Below is a table which shows the water resistance rating and the suitability of the watch for water resistance.
Some watches use bar instead of meters, which may then be multiplied by 10 to be approximately equal to the rating based on meters. therefore, a 10 bar watch is equivalent to a 100 meter watch. Some watches are rated in atmospherers (atm), which are roughly equivalent to bar.
| Water Resistance Rating |
Suitability |
Remarks |
| 30m or 50m |
Suitable for washing hands. 50m
suitable for showering and
light swimming. |
Not suitable for swimming or diving. |
| 100 m |
Suitable for recreational surfing swimming, snorkeling, sailing and water sports |
Not suitable for diving |
| 200 m |
Suitable for professional marine activity and serious surface water sports. |
Suitable for diving. |
| Diver's 100 m |
Minimum ISO standard (ISO 6425) for scuba diving at depths NOT requiring helium gas. |
Diver's 100 m and 150 m watches are generally old(er) watches. |
| Diver's 200 m or 300 m |
Suitable for scuba diving at depths NOT requiring helium gas. |
Typial ratings for contemporqary diver's watches. |
| Diver's 300+ mm helium safe |
Suitable for saturation diving (helium enriched environment). |
Watches designed for helium mixed-gas diving will have additional markings to piot this out. |
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