The Ultimate Guide to Water Resistance: What the Ratings on Your Watch Really Mean

Choosing a watch that fits your lifestyle means knowing exactly what it can handle. One of the most common points of confusion for watch buyers is the water resistance rating. What does "30M" or "100M" actually mean? Can you really dive to 100 meters with your new timepiece?

The simple answer is no. The numbers on your watch don't refer to a real-world diving depth. They represent the pressure a watch can withstand under perfect laboratory conditions. Understanding these ratings is crucial to keeping your watch safe, and we're here to help you decode them.

The Misconception of "Meters" (M)

The ratings of 30M, 50M, 100M, and so on are based on a static pressure test. They indicate the pressure the watch can endure in a controlled setting, not the dynamic pressure from a person's movements while swimming, diving, or showering. A simple splash from a faucet can exert more pressure on a watch's seals than a light rain.

To avoid damage, always use the ratings as a guide for activity, not depth.

Decoding the Water Resistance Ratings

• Water Resistant (30M / 3ATM) This is the most basic level of resistance. Your watch can handle light splashes, rain, or a quick hand wash, but it should not be submerged in water. Do not wear a 30M watch in the shower, a pool, or while doing dishes.

• Water Resistant 50M (5ATM) A 50M watch is suitable for light swimming in shallow water and can handle more than just splashes. However, it is not built for high-impact water activities like diving or surfing.

• Water Resistant 100M (10ATM) This is the ideal rating for most people. A 100M watch can be worn while swimming, snorkeling, and in most casual water environments. It's a reliable choice for everyday use and an active lifestyle.

• Water Resistant 200M (20ATM) & More A watch with this rating is built for serious water sports and is suitable for recreational scuba diving. These timepieces are designed to withstand significant pressure and prolonged submersion.

• Diver's Watch (ISO 6425) This is the gold standard for water resistance. A true diver's watch has a minimum rating of 100M and must pass a series of rigorous tests set by the International Organization for Standardization (ISO). These watches often feature a screw-down crown for added security.

Important Tips to Protect Your Watch

To maintain your watch's water resistance for years to come, keep these simple rules in mind:

• Avoid Hot Water: Hot water and steam from a shower or hot tub can expand the watch's gaskets and compromise the water-resistant seal.

• Don't Press the Buttons Underwater: Never operate the crown or pushers (like on a chronograph) when the watch is submerged, as this can allow water to enter the case.

• Check the Crown: Always ensure your watch's crown is pushed in completely. If it's a screw-down crown, make sure it's securely tightened before exposing it to water.

• Regular Servicing: The seals and gaskets that protect your watch from water can wear out over time. Having your watch serviced every few years will ensure its water resistance remains intact.

Knowing your watch's water resistance rating is essential for its longevity. At TA-Collection, we clearly list the water resistance rating on every product page so you can choose a timepiece with confidence, knowing exactly what it can handle.

Explore our collection today to find a watch that fits your lifestyle.