3.5 Bar what it means in terms of water resistance?
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3 bar of water resistance performance is sufficient for everyday sketches. However, this is not enough for high strength performance.
The pressure does not matter how much it is, but how it is applied to the tester.
A watch that holds for example 3.0 bar of pulsed pressure for example at 0.7u we are far beyond 100 meters (this is generally the test that is done to rolex gen with ALC2000 for example)
The ideal to swim with a standard pressure tester is that he resists at least 5/6 atm.
Always check before diving a watch in the water, especially a BP watch where the tube and crown theards and gaskets really sucks.
I was getting sea water into my old SD BP stock and all the movement was completely rusty after the dealer had said it was 5 atm resistant. Never trust them.
Apply silicone grease, and eventually reaplce the gaskets, then tighten the caseback well, and after test the watch to avoid throwing the watch into the bin.