Proper sealing and pressure testing is vital for all water resistant watches. The watchmaker must replace the gaskets in a watch after it has been cleaned. The watch is then carefully closed, sealing the case to protect the movement and dial. Once the case has been resealed, the watch is then tested for potential leaks and its ability to maintain the manufactures original pressure-proof standards.

This is done using state of the art equipment which performs compression and vacuum air tests. These tests measure the deformation of the watch case to to 1/10,000 mm and indicate the water resistance of a watch in units of bars/atmospheres(ATM).

1 bar/ATM = 33ft = 10 meters.

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