top of page
Oris Aquis Close Up Banner.jpg

Understanding Water Resistance Ratings

What are the different water resistance ratings, what does it mean and how can you ensure your watch remains water resistant.

No Meter Ratings

Use caution near water, may withstand splashing and rain.

30 Meters

100 Feet


This level will easily withstand splashes or brief immersion in water, or getting caught in the rain. However, it is not sufficiently resistant for swimming or bathing.

50 Meters
165 Feet

A watch with this level of resistance is wearable around household sinks, while playing sports and while swimming in shallow water for brief periods of time. Do not wear it while bathing, snorkeling or scuba diving.

100 Meters
330 Feet
10 ATM

This level of water resistance will allow a watch to be worn around household sinks, while playing sports and while swimming in shallow water. Do not wear it while scuba diving.

200 Meters +
20 ATM +

A watch with this resistance level is wearable while swimming or diving. It is also suitable for snorkeling and scuba diving.

Water Resistant Testing is a highly involved process that takes several steps and utilizes our state of the art equipment.

The watch case is manufactured to be water resistant, however anywhere there is an opening in the case there is the potential of a leak. For example, the potential locations for leaks in water-resistant watches include:
– Case back to case frame
– Crystal to case frame
– Crown to tube
– Tube to case frame
Any failure in these areas or components can cause major damage, depending on the exposure and severity. Each “opening” in a water-resistant watch must have a means to ensure its seal. Ideally during service, it should be capable of being brought back to the original water-resistant specs by the replacement of the components and/or repair of the case.

Why Do Components Fail?
There are numerous reasons. Back gaskets can be come stretched, damaged or cut, just to name a few. Crystal gaskets can be adversely-affected by UV rays, chemicals and exposure to objects. A crystal’s surface area is also a large area of concern. The crowns usually contain gaskets that can fail by wear, dryness or shock. Case tubes and their connection points can fail from shocks, wear and ill-fitting parts. With so many points of potential failure, many of which you cannot see with the naked eye, it is absolutely necessary to use the modern water-testing equipment.
(from Horological Times February 2012)

Its always advised to read the manufacturer’s recommendations for regular maintenance. If you do swim or dive often, have the watch water tested every year. if you aren’t sure how much water your watch can really withstand, we are always happy to test it for you.

Also remember, if your watch is fitted with a screw-down crown and helium valve, both crowns must always be properly closed and tightened prior to any water use. Never operate the crowns while the watch is still wet.

Our State of the Art Water-Proofing Equipment

bottom of page