Made for checking how watertight your sports watch is. The watertightness check protects your watch from dust and damp so that it won't get damaged if submerged in water.
The test is performed under 5 atmospheres so that the seals can be checked by seeing how much air there is in the watch. A variation in this volume of air would need the faulty seal to be checked and potentially changed.
To make sure you can use your watch properly, we recommend having its watertightness checked each year if you often use it in water, and/or when you get the battery changed.
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We recommend storing your product in a cool, dry place.