All Rolex Oyster watch case thoroughly waterproof test. The way, this is often done with air pressure tank watch-making. A watch was placed in a small chamber filled with air, and if the pressure changes, it means that the air leaking into the case. Each Rolex Oyster and oyster diving watches beginning this air pressure treatment. In fact, in each case before and motion, the disc is placed in its internal testing.
Diving watch receives separate treatment together. After air pressure test, Rolex into the water resistance test each and every Rolex snorkeling and deep sea watches the actual water. This type of testing is rare. Submariner watch is placed in full of water, to ensure that they are waterproof 300 meters of the pipe. Testing is extremely complex, because Rolex uses a complex system for testing, in the case if the water entry.
Watch after exit slot, they are heated and a drop of cold water is placed in a crystal to see if condensation forms. The optical sensor then scans them traces of water. Less than one thousand watches a test failure. This story is more intense deep sea watches. Rolex co-developed a special high-pressure water tank COMEX depth testing each deep sea watches. Pressure tank looks like something of a science fiction movie. Imagine something that looks like a Gatling gun several tons. The machine uses more than one hour, and each watch is equivalent to 12,000 meters of pressure.