Guide
Watch Water Resistance Explained
The honest, plain-English version of what those ATM numbers actually mean for daily wear.
Quick answer: Water resistance ratings are lab pressure tests, not depth limits. 30m is splash only; 50m means splashes and everyday wear, not for swimming; 100m covers swimming and snorkelling; 200m covers recreational watersports. Rose & Rotors watches are rated 100m.
Shop Dive Watches →What each rating means
- 30m (3 ATM): Rain and splashes only
- 50m (5 ATM): Splashes and everyday wear. Not for swimming.
- 100m (10 ATM): Swimming and snorkelling
- 200m (20 ATM): Recreational diving and watersports
- 300m+: Professional diving
Why the numbers seem high
The test is done once, in still water, on a new watch. Movement, temperature changes and ageing seals all reduce real-world resistance.
Keeping your watch water-tight
- Always screw the crown fully down before water
- Never operate the crown or pushers underwater
- Rinse in fresh water after the sea or a pool
- Avoid hot showers, saunas and hot tubs
- Have the seals pressure-tested every one to two years if you swim often
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Frequently Asked Questions
Can I shower with a 100m watch?
We advise against it — hot water and soap degrade seals.
Can I swim with a 50m watch?
No. 50m means splashes and everyday wear. Not for swimming.
What rating are Rose & Rotors watches?
100m (10 ATM).