Watch water-resistance guide
A depth marking is a test result, not a promise.
Water-resistance ratings describe controlled pressure tests. Real use also depends on seals, age, temperature, crown condition and how the watch is used.
Important
No watch should be treated as permanently waterproof. Have the case tested after opening, impact or service, and follow the maker’s own instructions.
MarkingWhat it indicatesPractical guide
No markingNot water resistantKeep away from water
3 bar / 30 mEveryday splash resistanceRain and brief splashes only
5 bar / 50 mEnhanced everyday resistanceGeneral water contact, subject to manufacturer guidance
10 bar / 100 mSuitable for more active water useSwimming and surface water sports where the maker permits
20 bar / 200 m+High water-resistance ratingDiving only where the watch is specifically certified and maintained
Why testing matters
Seals are service items.
Gaskets can flatten, dry and degrade. Crowns, pushers and crystals can also be compromised by wear or impact. A dry pressure test looks for case deformation under controlled pressure without putting the movement in water.
Arrange a pressure test