Once your Rolex receives a thorough cleaning, polishing and servicing, it has to pass a series of rigorous quality tests such as pressure proof test and the timekeeping test. The pressure proof test is conducted on the Oyster case without the movement inside. A special tank, called a "Mariotte" meter and equipped with high tech electronics, is used for this test. Inside the tank, a vacuum air-pressure is created to test the watch at its guaranteed depth. A similar test is also conducted during the making of Rolex watches at their premises.
As a direct consequence, once you service your Rolex at a Rolex Service Center, you can be assured of receiving the same quality in your watch as a brand new Rolex exhibits. After the watch passes the pressure proof test, it is installed with the movement, re-lubricated and tested for accuracy in timekeeping. If it shows any minor deviations, a special Rolex device called the "Microstella Tool" is used to make micro adjustments to correct those deviations.
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