How often does a watchs water resistance need to be checked?
All water resistant watches need to have their water resistance checked ever time the battery is changed or the case is opened for any other reason. That’s because when the case is opened, the gaskets that keep the water out of the case are dislodged. (These gaskets, or O rings, are located inside the case at the joints where the case meets the case back, crown and crystal). For this reason it’s important that when the battery in a water-resistant watch needs to be changed, the watch should be taken to a repair center that has water-resistance testing equipment. In some instances, water-resistance should be checked between battery changes. If the watch is worn in the water, frequently or exposed to a lot of sweat, it should be checked at least ever two years and, if exposure to water is very frequent, ever year.
