Difference between air and water pressure

[BigHat]

Originally Posted by wuzzzer

Rolexes are tested to both positive and negative pressure. That's one of the reasons why they legally can call their watches waterproof, not simply water resistant. They many times use the term pressureproof as well.

Actually, there is no "legally" about it. Many posts about it. Do a search.

Also I have never heard your assertion regarding positive and negative pressure. The testing process as well documented as pulling a vacuum and assessing crystal deflection. Please tell us more about what you mean.

Edit: I pulled up one of the threads for you:
http://www.rolexforums.com/showthrea...ght=Waterproof