Gaskets between the case back, setting crown, & crystal deteriorate over time under normal use as they are subject to many aggression’s; perspiration, dust, cosmetics, temperature changes, ultraviolet rays, chlorine or salt water, etc. leaving your watch vulnerable to moisture damage.
A federally approved term to indicate the amount of pressure a watch can withstand under water without leaking or losing accuracy.
Water tightness is achieved by installing seals between major parts of the watch case and a specially designed setting crown which, together, prevent moisture from entering the case.
Micro processor based measurement system.
Leakage rate is always referred back to the ISO 2281 Standard.