This is a list of shortcomings and problems which occur when presure testing a watch.

The watch expolding in the presure tester: Yes this can happen. Usually when the watch has a slow leak which you do not spot so the pressure difference between inside the watch and outside is to much and the glass pops off Filling the watch up with water. This is why you never do the test in fornt of a customer

Air/Water Leaks in but not out: this generally happens on watches with a screw crown and it is hard to spot

Sometimes you just cant tell: Watches with many air voids in the casing can hide a leak (especially Casio G-Shock). There are just so many bubbles you just cant tell.

A Leak at low Pressure: If the back does not fit well or a seal is too small the presure at 3bar seals the watch and you think the watch is waterproof when it isn't

Misting of the glass: Sometimes a watch can look like it has let water in and it hasn't. There are 2 main types of misting.
1): The glass can "steam up" with humidity in the air. Hot humid air gets in the watch then when the weather cools down water is deposited on the glass (as its the coolest surface)
2): The oils (I think) evaporate and deposite themselves on the glass.
The humidity is important to remove as it is water and does rust parts it may come in contact with

Static Test Isn't the real world: The watch is stationary in the pressure tester and this is not how the watch will be used. Moveing, knocking, and touching pushers and crowns can not be tested. Changes in temperature also affect the water resistancy. A sudden change from the heat of a sunny beach to a cold sea can make a normally waterproof watch leak. You can't test any of these scenarios.

Waterproof Today Leaking Tomorrow: a seal can fail this fast. Change the time or date, press a button or knock the watch and it could fail. Water is a powerfull enemy and sneaks in through the smallest gap.

Extreme Temperature: I have had 2 watches that have failed when the user has gone in water to "cool off" after sunbathing. The watches presuretested fine before and after the leak and i am sure it is the sudden change in temperature. For this reason I also do not recomend doing the washing up with any watch. I am also suspicious of some detergents damageing the rubber seals.

Any Extreme Condition: Saunas, Steam, really hot water, freezing cold, Strong Vibrations, etc. are all conditions that the watch was never designed for.

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