The Numbers on Your Watch Do Not Mean What You Think
A watch rated to 100 metres does not mean you can dive to 100 metres. Understanding what water resistance ratings actually mean will help you use your watch with confidence.
How Water Resistance Is Tested
Water resistance is tested under static pressure in a laboratory. A 100m (10 ATM) rated watch has been subjected to 100m equivalent pressure in controlled conditions — no movement, no temperature changes. Real-world use introduces dynamic pressure that exceeds the static rating.
What Each Rating Actually Allows
30m (3 ATM): splashes and rain only. 50m (5 ATM): brief swimming. 100m (10 ATM): recreational swimming, snorkelling, water sports — like every CrownCraft watch. 200m+ (20 ATM): serious recreational diving.
100 Metres Is the Sweet Spot
For most people who aren't professional divers, 100m covers everything: pools, the ocean, water sports, and showers. The CrownCraft DEEPMASTER is purpose-built for water with a unidirectional ceramic bezel and screw-down crown. See our Best Dive Watches Under €250 for a comparison.
How to Preserve Water Resistance
Never operate the crown while wet or submerged. Rinse with fresh water after saltwater exposure. Avoid extreme temperature changes. Have gaskets checked during your 5-7 year service interval.
Every CrownCraft Is Built for Water
All six models — including the dress-oriented CENTRE COURT and the open-heart ROADSTER — are rated to 100m. This is uncommon; many brands rate dress watches to just 30-50m.
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