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New Pressure Tanks & Water Resistance

All our nationwide branches now have a new state-of-the-art watch water resistance tester; the Witschi Chronoproof Pro.

This is an automatic tester using both vacuum and pressure to determine whether a watch is water resistant. After the watch has been tested, the results are printed and given to our customers to give them the peace of mind that following a repair with The Watch Lab their watch has been correctly resealed.

All watches that are rated as being 50m/5 ATM or above (i.e. suitable for surface swimming) will receive a water resistance test. Features include:- 

  • Automatic parametrisation & test cycle: The test cycle starts automatically on closing the test chamber. Stabilisation and measurement times are automatically adapted to suit the watch. 
  • Reliable and accurate test results: result are measured up to a resolution of 0.02 µm; 1/5000 of the thickness of an average human hair.

Need a watch testing? Please visit one of our nation-wide branches

Water Resistance in Watches:-                                                          Written By The Watch Labs Watchmaker Apprentices 

Water resistance is tested and measured with both watch and water/air being static. It is advisable to get a watch with a greater water resistance than what you want to use it for as when moving about the water can exert different amounts of pressure on the watch.

There is currently an effort underway to change the language of the water resistance rating as it is seem as not being clear to the general population; many of whom would see a 30m watch as being suitable for diving up to 30m.

 Please see below table below for water resistance guide

When testing a watch this can be a dry or wet test and is measured at different pressures. If a watch fails the pressure test, further tests can be done to find the source of the leak. A wet pressure tester is used to show where the leak is coming from and how severe the leak is. By placing the pressurised watch in water and then equalizing the pressure, a stream of bubbles will be observed coming from a defective section of the watch. Once the source of the leak has been found further measures can be done to restore the water resistance.

A watch keeps its water resistance by using rubber or hard gaskets. Gaskets can be found on, the case-back, glass, crown and also pushers.

Other factors can affect the water resistance of a watch, for example a change in temperature, wearing a watch in high temperature can cause the gaskets to expand and then shrink after the watch cools. 

Divers Watches

Watches that are produced for diving need to be sent to the original manufacturers for resealing. They will be able to provide a certificate which someone using their watch for diving can pass to their insurers. The correct testing and certificate is required due to the watch being use as a life dependent device. On a watch with a unidirectional rotating bezel, this is used by a diver to show how much time has elapsed.

Seiko SKX007 (7S26-0020)
Citizen Watch Promaster BN2021-03E

The Watch Lab has accounts with all the major manufacturers and are able to help with your watch’s resealing and repair. Please visit one of our branches for a free estimate.

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