Understanding Watch Water Resistance Ratings

Understanding Watch Water Resistance

Water resistance ratings confuse many watch buyers. The numbers don’t mean what you might expect. Understanding the ratings prevents expensive damage to your timepiece.

Rating Basics

Ratings like 30m, 50m, and 100m indicate pressure resistance, not diving depth. Laboratory conditions differ from real-world water activities. Higher ratings provide better protection margins.

30m Water Resistance

Suitable for splashes and brief hand washing only. Not safe for swimming or showering. The most basic protection level. Found on dress watches prioritizing slim profiles.

50-100m Water Resistance

Safe for swimming and showering. Not intended for diving or water sports with impact. Suitable for most everyday activities. Common on sport and casual watches.

200m and Beyond

Designed for recreational diving and water sports. Screw-down crowns provide enhanced sealing. ISO certified dive watches meet additional standards. Serious diving requires 300m+ ratings.

Maintaining Water Resistance

Gaskets degrade over time. Annual pressure testing ensures continued protection. Avoid operating crowns when wet. Service after any water intrusion immediately.