Knowledge
A watch described as “water-resistant” or as a “diving” model by its manufacturer must comply with international standards.
A water-resistant watch is designed to withstand water ingress, particularly in the event of excess pressure caused by immersion. The water-resistance rating is indicated in bars or metres on the watch or in its accompanying documents.
In the absence of any indication, this limit is set by default at 2 bar, equivalent to a depth of approximately 20 metres underwater.
It can therefore be worn during all daily activities involving water, such as washing hands, showering, as well as common aquatic and nautical activities.
The water resistance of a watch is also defined by the model’s specifications. It is therefore advisable to follow the manufacturer’s instructions, particularly regarding the use of the watch and maintenance advice, in order to preserve its water resistance.
A diving watch, on the other hand, is a water-resistant watch that must meet additional standardised criteria. These include: water resistance to at least 100 metres (10 bar) ; nocturnal visibility of dial markings; a dive-time indicator ; resistance to shocks and magnetic fields; as well as a sturdy wristband.
All these requirements are defined by two standards established by the International Organization for Standardization (ISO) : ISO 22810 sets out those for water-resistant watches, while ISO 6425 stipulates those for diver’s watches.
For further information on this topic, see also ‘Deep dive into water resistance’
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