Watch water resistance ratings can seem very simple at a quick glance. When talking about water resistance, you often hear terms like "waterproof," "water-resistant," or "watertight." Logically, you might think that a 5 ATM / 50 m water resistance rating means you can dive with the watch to a depth of 50 meters. In reality, however, this isn't the case, which is why water resistance ratings on watches often leave customers scratching their heads. Water resistance can be marked in several different ways, and the actual meaning behind these markings remains unclear to many watch users. That's why we've put together this guide to help you find out your watch's true water resistance. Water resistance is, after all, a very important factor when it comes to using your watch.
When assessing a watch's water resistance, it's a good idea to take the watch's age into account. A watch's water resistance relies on seals that keep water and moisture from getting inside the watch. Over time, however, these seals can become brittle, dry out, and harden. As the seals age, this can have a negative effect on the watch's water resistance. That's why we always recommend avoiding getting your watch wet on purpose.
A watch's water resistance can be indicated in several different ways. HAVU watches use the ATM rating system to indicate water resistance. A 5 ATM rating corresponds to 5 bar or 50 m. The most common water resistance ratings can be interpreted as follows:
3 ATM / 3 bar / 30 m
A watch with this water resistance rating is splash-resistant. It shouldn't be submerged in water, but it can withstand everyday splashes, such as when washing your hands or getting caught in the rain. We recommend avoiding getting a watch with this rating wet in any situation, so you can avoid any unpleasant surprises.
5 ATM / 5 bar / 50 m
A watch with this water resistance rating is noticeably more water-resistant than one with a 3 ATM rating. The watch can handle water in everyday use, and thanks to its water resistance, it can be worn not just while washing your hands but also, for example, in the shower. However, submerging the watch in water isn't recommended. Despite its water resistance, the watch isn't designed for diving or swimming, so we recommend avoiding unnecessary exposure to water for watches with this rating as well. This water resistance rating can be found, for example, on the Korpi and Harju watches, made from Finnish birch.
10 ATM / 10 bar / 100 m
A watch with a 10 ATM rating is significantly more water-resistant than watches with lower ratings and is designed to be used in water. A watch with this rating can be worn while swimming or, say, playing water polo. For deep-water diving, however, it's best to use a watch with an even higher water resistance rating.
20 ATM / 20 bar / 200 m
A watch with a 20 ATM rating is designed for use in water. It can handle activities like recreational diving and other water sports. Aside from professional saturation diving, a watch with this water resistance rating can be used for pretty much any water sport or activity.
As mentioned earlier, a watch's water resistance relies on the seals inside it that keep water from getting in. Even if a watch is water-resistant, it's best not to expose it to major temperature swings. A good example of this is going to the sauna. While in the sauna, the watch is exposed to intense heat. After the löyly (sauna steam), cool air and a shower can expose the watch to such a big temperature change that the seal can't keep up. This can cause moisture damage even to a watch with a strong water resistance rating.
It's worth getting to know your own watch's water resistance and using it accordingly. It pays to be careful with your watch around water, but there's no need to worry too much - after all, watches are meant to be used. With these guidelines and tips, you'll be able to use your watch with confidence, within the limits of its water resistance.
All HAVU watches are protected against splashes and dust, with water resistance ratings of either 3 ATM or 5 ATM. You don't need to worry about your watch getting wet during normal use. For example, there's no need to take it off your wrist when washing your hands or if you get caught in the rain. However, when heading to the sauna or going for a swim, it's best to leave your watch on the table to wait for you.
Click here to explore our collection.