No waterproof watch is absolutely watertight. Waterproof watch waterproof measures mainly rely on the watch glass inside the tightening ring and the case with a relatively tight, as well as the watch back cover, shank head (upper bar shank) placed in the waterproof rubber ring, so as to make it sealed.
However, a watch cannot be new forever. With the increase in the use of the watch time, the waterproof watch waterproof performance will gradually reduce, specifically:
1. Most of the watch glass is made of plexiglass, which will be loosened and unevenly affixed due to thermal expansion and contraction or aging and deterioration over time.
2. Because of the upper strip need to turn the handle, or pull out the handle toggle pin, etc., after a long time, the handle inside the rubber ring will wear or aging.
3. The waterproof rubber ring on the back cover will gradually lose its waterproof function due to sweat oxidation and natural aging.
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Therefore, a new waterproof watch splashed with water or fall into the water for a short time may not enter the water. However, after a period of time, the waterproof performance of the waterproof watch gradually recedes, it can not be waterproof, at least it is unreliable, therefore, waterproof watches can not be permanently waterproof. Of course, there are special features of diving watches can work underwater for a longer period of time and maintain their waterproof performance for a longer period of time.