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Blog, Mechanisms and construction

Does water resistance in a watch matter or is it just marketing?

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zegarek mechaniczny


Many people wonder: Can a watch get wet without being damaged? The answer depends on the water resistance class – the degree to which the watch is protected from water. Water resistance is more than just a marketing ploy – this feature actually protects the movement from moisture, but the key is what the specific parameters mean. The classes listed (e.g., 3 ATM, 5 ATM, 10 ATM) are based on testing standards and refer to resistance to static pressure. They do not mean However, it is submersible to the specified depth in all conditions. Understanding water resistance classes will help you avoid disappointment and choose a watch that suits your lifestyle. In this article, we'll debunk marketing myths and explain what each water resistance rating really means.

What exactly is water resistance in a watch?

  • Water resistance (water resistance) measures how much water pressure a watch can withstand without leaking. During pressure testing, the watch is submerged in a tank of water to a specified depth, ensuring no water gets inside. Water resistance classes are standardized: lower classes (30–50 m) are tested according to the ISO 2281 standard, while diving watches (from 100 m and above) are tested according to ISO 6425. The ISO 6425 standard covers rigorous tests (including pressure, shock, and night vision), and models meeting these criteria may be marked "Diver's" or "Diver's 200M" on the dial. Our 30 ATM collection includes models from the Horizon, Nebula i Skeleton, and 10 ATM — Solara i Zenith.

    In practice, no watch is absolutely "waterproof" - it is better to use the term waterproof. Designations in meters or ATM simply indicate the test result. For example, even a 50 m watch doesn't guarantee complete safety at a depth of 50 m – that's merely the result of static laboratory tests. Watch shops agree on the interpretation of the classes: 30 m/3 ATM is protection against accidental splashes, while 50 m/5 ATM also covers bathing or surface swimming. To be on the safe side, consider a model with diving certification – for example, ISO 6425 for deep immersion.

Is the watch's water resistance just marketing?

  • Water resistance is a real feature, but it's easy to be misled by marketing. Manufacturers often flaunt numbers (e.g., "50M"), which may suggest the watch has superpowers. In practice, however, each rating is based on a test under ideal conditions— NO There's no guarantee the watch will survive any dive. Even the "50M" rating doesn't guarantee deep immersion—it rather means the watch will withstand rain or showers.

    We emphasize: it's worth trusting specifics, not advertising slogans. If a watch has the ISO 6425 standard (usually "Diver's 200M"), then it's designed for scuba diving. Classes 3–5 ATM, on the other hand, guarantee safety only in everyday water situations. Therefore, customers at Celesti Watches should pay attention to the product description – the presence of the standard or specific numbers. This way, marketing hype won't obscure the watch's true capabilities.

How to read water resistance markings?

  1. Knowing the basic classes will allow you to use your watch safely. Here's a rough explanation:

    • 3 ATM (30 m) – Splash resistance. With a 3 ATM watch, you can safely wash your hands, be out in the rain, or do everyday household chores. Definitely don't swim or enter water with it.
    • 5 ATM (50 m) – It's also suitable for bathing and light swimming. Wear it in the shower, pool, or while bathing – it will withstand contact with water. However, it's not suitable for diving or intense immersion.
    • 10 ATM (100 m) – you can swim and snorkel without worry. The 10 ATM model covers all lower-level activities (showering, shallow swimming). However, extended scuba diving should still be avoided, as it lacks specific diving certifications.
    • 20 ATM (200 m) – a watch for water sports and recreational diving. It allows for safe scuba diving at typical depths without the need for helium. Watches rated ≥20 ATM (sometimes 30 ATM or higher) are often true diver watches, ready for extreme conditions.

    It is worth knowing that it is advisable depths are the results of static tests – for example, the 100 m rating doesn't mean a full day of diving at 100 m. Experts remind us that these are laboratory figures, and in real-world conditions, watches operate differently. Top manufacturers emphasize that despite high values suggesting water resistance, you should always follow the instructions and service your watch.

Zegarek Celesti Astra Void
Celesti Astra Void Watch


What is the practical use of waterproofing?

In everyday life, waterproofness makes many activities easier:

  • Rain and snow: A watch rated 3-5 ATM will protect you from accidental splashes while walking or gardening. The movement remains dry as long as it doesn't come into direct contact with water.
  • Hand washing and daily activities: Even the basic 3 ATM rating allows you to safely wash your hands. 5 ATM models can also withstand showering or dishwashing without damage. Just remember to dry your watch thoroughly after contact with water.
  • Sports and recreation: If you frequently exercise or swim recreationally, choose at least 10 ATM. With such a watch, you can confidently run in the rain or jump into the pool. 20 ATM models are designed for semi-professional divers. Celesti Watches offers sporty models with a rubber strap, perfect for water activities.
  • Limits of use: Even the most waterproof models are sensitive to sudden temperature changes. Avoid very hot water (showers, saunas, jacuzzis) – steam can damage the seals. It's best to use a diving or recreational watch as intended: remove it before entering a sauna and dry it after soaking in salt water.

It's also worth remembering that water resistance is beneficial not only against water but also against splashes from other liquids, such as sweat. If you're training intensely, a 10 ATM watch will easily protect the mechanism from sweat. This means you can wear your favorite Celesti model even during intense physical activity.


The most common user errors

Neglecting service: Water resistance isn't a permanent feature. Over time, the seals harden and crack. Experts recommend having your watch serviced every few years to have the seals replaced. Without this, the watch loses its full water resistance, even if it was factory-tested to a high standard.

Confusing WR with diving: Assuming that "50 m" on the dial means it's suitable for swimming or diving is a mistake – 50 m/5 ATM only protects against light splashes. For swimming and diving, you need at least 10 ATM.

Using your watch in hot water: Saunas, hot showers, or jacuzzi baths can cause your watch to leak. High temperatures and steam can damage the seals. Always remove your watch during these activities.

Pressing the crown or buttons underwater: Many users forget that all components must be in the rest position. If you press the chronograph button or fail to screw the crown down while submerged, water will seep in. Check that the crown is screwed down before entering the water.

Storage in a humid place: Regularly leaving your watch in the bathroom, for example, after bathing, can gradually reduce the effectiveness of the seals. It's better to store your watch in a cool, dry place when not wearing it.

Careless cleaning with chemicals: While not a common "mistake," contact with detergents, perfumes, or salt can weaken the seals. After using cosmetics or cleaning products that have adhered to the watch, it's a good idea to quickly rinse it with clean water.

Zegarek Celesti Astra Tidal
Celesti Astra Tidal Watch


What should you pay attention to when buying a watch?

Your needs: Consider whether you need an elegant or sporty style. A 20 ATM diving watch may have a large case, which doesn't suit everyone's suit. If appearance and comfort are important, choose a 3-5 ATM model, and keep a separate sports watch for water or sports.

Lifestyle: Evaluate how often the watch will be exposed to water. If you regularly swim or run in the rain, look for a rating of at least 10 ATM. If you primarily need a watch for wearing to a suit or the office, 3–5 ATM will suffice.

Strap material: A leather strap doesn't affect the case's water resistance and will quickly become damaged by water. For water-based watches, choose a steel bracelet or rubber/nylon straps. These straps will easily withstand the pool or sweat.

Mechanism and housing: Watches with a screw-down crown and caseback have additional water resistance. Check the manufacturer's ISO standards and whether they conduct water-tightness tests.

Offer details: At Celesti Watches, you'll find water resistance descriptions for every product. Pay attention to the small print, such as "do not press buttons underwater" or periodic maintenance. Honest manufacturers emphasize what you can and can't do to your watch.

Summary

The water resistance of a watch is not an advertising gimmick, but a practical feature – provided you understand it. A 3-5 ATM watch is suitable for everyday use (rain, washing hands), a 10 ATM watch is perfect for swimming enthusiasts, and a 20 ATM watch is a fully-fledged diving watch. Remember to secure the crown, avoid hot water, and have it serviced regularly – this will ensure your watch remains reliable in all conditions. Celesti Watches combine elegance with practical water resistance – check out the full Celesti Watches offer and find the perfect watch for you.


If you are looking for a new Diver watch, Check out Celesti Watches' offer!

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Frequently asked questions

arrow Is 3 ATM enough for everyday use?
Yes, the 3 ATM (30 m) rating protects the watch against splashes – you can wash your hands or be out in the rain without worry. However, avoid bathing or swimming with this model.
arrow Is a 5 ATM watch suitable for hand washing?
Of course. 5 ATM (50 m) allows for washing hands, bathing, or swimming in the pool (surface swimming). This watch will survive most everyday water situations.
arrow Can you swim with a 10 ATM watch?
Yes, 10 ATM (100 m) is the minimum recommended for swimming and snorkeling. Diving there is also very safe, but just to be safe, don't go too deep.
arrow Does water resistance decrease over time?
Unfortunately, yes. The seals inside the watch lose their elasticity and tightness over time. Regular servicing (every few years) with seal replacement restores factory parameters.
arrow Does the leather strap affect the water resistance?
The strap itself doesn't determine the case's water resistance, but water damages the leather. Even a durable watch with an Italian strap should be removed before prolonged exposure to water. The leather dries out and cracks, so a rubber or metal strap is better for water activities.
arrow Is the sauna harmful to the watch?
Yes, very much so. High temperatures and steam can cause a watch to leak – the seals don't like sudden changes in temperature. Even watches with high water resistance should be removed before taking a sauna or hot shower.

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