Blue Nile Glossary
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  Water resistance:  
  The ability of a watch to resist penetration by water. If the watch is to withstand water as stated by the manufacturer, the crown, case, stem, and crystal must be intact. Some watches are resistant to higher pressures experienced at underwater depths. Most watches list water resistance in either ATMs or BARs. ATM stands for atmospheres, and each atmosphere equals roughly 33 feet of water depth. BAR is a unit of pressure equal to roughly .99 atmospheres. Typically, a watch with 10 BAR engraved on the case is suitable for water contact from showering to snorkel-depth swimming. Water resistance listed on this site refers to the watch itself and not the watch strap. Watch straps of any type of natural material (such as leather, suede, fabric) are not water resistant.

See also: Watch Anatomy.

 

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