Understanding Watch Water Resistance Ratings

When choosing a timepiece, water resistance is a key consideration—especially if you lead an active lifestyle or enjoy water-based activities. But what do the various water resistance ratings actually mean? At Rotary Watches, we build timepieces designed to suit a range of requirements, from everyday and formal wear to adventure-ready dive watches like the Seamatic collection. Let’s take a look at the water resistance ratings to help you choose the right watch for your needs.

What is Water Resistance?

Water resistance indicates how well a watch can withstand exposure to moisture, but it doesn’t mean the watch is completely waterproof. Each rating is tested under controlled conditions, and real-world use—such as temperature changes and water pressure from movement—can affect a watch’s actual resistance.

Understanding the Ratings

30M (3ATM) – Splash-Resistant: Watches with a 30M rating, such as many of our classic dress watches, can handle everyday splashes from rain or hand washing but should not be submerged in water.

50M (5ATM) – Suitable for Light Water Exposure: With a 50M rating, your watch can withstand accidental submersion, such as when washing your car or getting caught in a downpour, but it’s not recommended for swimming.

100M (10ATM) – Ideal for Swimming and Snorkelling: A 100M-rated Rotary watch, like our Rotary Sport models, is suitable for swimming and snorkelling but not high-pressure activities like diving.

Diving Watches – Built for the Depths: Professional diving watches exceed 200M, ensuring they can handle deep-sea pressure. Our Seamatic collection is engineered for 300M water resistance and durability.

Maintaining Your Watch’s Water Resistance

• Regular Servicing: Seals and gaskets can degrade over time, so we recommend professional servicing.
  
  

• Avoid Hot Water: Heat can cause seals to expand, compromising water resistance.
  
  

• Ensure Crown is Secure: If your watch has a screw-down crown, always check that it is fully tightened before water exposure.
  
  

• Rinse After Saltwater Use: If your watch has been in seawater, rinse it with fresh water to prevent corrosion.

Finding the Right Rotary Watch

Whether you need a sophisticated dress watch with light water resistance or a robust sports model for ocean adventures, Rotary offers a variety of timepieces designed to fit your unique. Explore our collections to find the perfect blend of style, functionality, and water resistance.