...when it's written on a watch? If you haven't figured out the water resistant watch depth measurement system, here's my understanding of it:
Won't survive contact with water.
30m / "Water Resist"
Splash proof, ie when washing hands
50m/ 5atm / "Water Resist"
Can shower or swim with it
100m / "Water Resistant"
Can scuba dive with it
Some watches may leak if you push their buttons under water, so you might want to avoid that. Also, the watch might require some readjustment every year or so, since wear and tear loosens the packaging and various chemicals (like sweat) erodes it. This should be mentioned in the warranty card.
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