Watch specs list water resistance as ATM, bar, or meters, and the numbers are confusing: a watch rated to "30 meters" shouldn't actually go 30 meters underwater. Here's what the ratings mean in real life.
The ratings are lab pressures, not depths
Water-resistance ratings come from static pressure tests in a lab. Real life adds movement: swinging an arm through water or jumping into a pool creates much more pressure than standing still at the same depth. So treat each rating as a category, not a depth limit.
What each rating is good for
- 3 ATM (30m): splashes and rain. Take it off to wash dishes or swim.
- 5 ATM (50m): hand-washing, rain, and a brief accidental dunk. Not for swimming.
- 10 ATM (100m): everyday water exposure including swimming at the surface. Not for diving.
- 20 ATM (200m) and dive-rated: snorkeling and recreational diving.
Things that matter more than the number
- Never press chronograph pushers or pull the crown underwater. That opens a path for water no matter the rating.
- Gaskets age. Seals dry out over the years; have water resistance re-tested when the battery is changed.
- Leather straps and water don't mix, even when the case can handle it.
- Hot tubs and saunas are hard on seals. Take your watch off.
Where Season watches fit
- Season No. 2 is rated 10 ATM on a steel bracelet, fine for rain, hand-washing, and the pool. Just don't work the chronograph pushers underwater.
- Season No. 1 is rated 5 ATM on leather: everyday wear and splashes, but take it off to swim.
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