The term water resistance refers to the watch's ability to withstand splashes of water to varying degrees.
You have to be careful when using a water resistant watch. The resistance of a watch is only an indication of how waterproof it is. If you are swimming with a watch, the movement of your arms will drastically alter the pressure that the watch is under. Or if you use your watch in a hot tub, sauna, bath or shower, the heat could cause the seals to expand. This would cause the water resistance to be compromised, making your watch less water resistant or even causing it to malfunction completely.
Water resistance is tested in still or static conditions. So, if you dive into a pool wearing a watch which is 50 metres water resistant, the pressure impacted upon the watch on hitting the water will be far greater than that experienced at a 50 metre static test. As a result, the number of metres shown on a watch face does not indicate the depth that the watch can be taken to.
|Swimming, Snorkelling, Water Sports||no||no||yes||yes||yes||yes|
|Professional Deep Sea Diving||no||no||no||no||no*||yes|
*only watches marked "Divers" on the dial should be used for diving, as they fully comply with the international standards for divers watches.
Watch manufacturers use other terms to measure water resistancy:
Rotary watches feature a unique 'Dolphin Standard' across their entire range of watches. Dolphin Standard means that these watches can be worn confidently all day whether you are swimming, wake boarding, or whatever water sports you prefer.