Water resistant watches carry a rating which is usually marked on the watch itself in either meters (m) or Atmospheres (ATM). This rating indicates how much pressure a watch can withstand when absolutely still before letting water in. Any movement of the watch causes greater pressure on the watch, which is why a 50 meter water resist watch cannot actually be worn to a depth of 50 meters.

Please use the following guide to ensure you understand the meaning of the different water resistance ratings:

Regardless of a watch's water resistance rating it should not be worn while in the bath, sauna etc as the sudden change in temperature can cause different components to expand at varying rates and thereby allow water in. Contact with chemicals (e.g. detergents, perfume, nail polish remover etc.) should be avoided as these can seriously effect the water resistance.  Always remove your watch before carrying out activities such as washing-up or washing the car.