Wristwatch water resistance - What do the water resistance ratings on watches mean?
The water resistance ratings of watches may seem quite straightforward at first glance. When discussing water resistance, you often hear terms like "waterproof" or "water-resistant." Logically, one might imagine that a 5 ATM / 50 m water resistance means that the watch can be submerged up to 50 meters underwater. However, this is not the case, which is why water resistance markings on wristwatches often confuse customers. Water resistance can be indicated in several ways, and the true meanings of these markings are often unclear to many watch users. Therefore, we have created this guide to help you determine the true water resistance of your watch. Water resistance is a crucial aspect of watch usage.
When evaluating a watch's water resistance, it's essential to consider the age of the watch. A watch's water resistance relies on seals that prevent water and moisture from entering the watch. However, these seals can become brittle, dry, and harden over time. The aging of these seals can negatively affect the watch's water resistance. Therefore, we always recommend avoiding intentionally submerging the watch in water.
The water resistance of a wristwatch can be indicated in various ways. HAVU wristwatches use the ATM classification to indicate water resistance. The most common interpretations of water resistance markings are as follows:
3 ATM / 3 bar / 30 m
A watch with this water resistance marking is splash-resistant. It should not be submerged in water, but it can withstand daily activities like handwashing or exposure to rain. We recommend avoiding unnecessary exposure to water for watches with this marking to avoid unpleasant surprises. This water resistance rating can be found, for example, in the Hiili and Viima wristwatches.
5 ATM / 5 bar / 50 m
A watch with this water resistance marking is significantly more water-resistant than one with a 3 ATM rating. It can withstand water during daily activities and can be worn while showering. However, it's not recommended for swimming or diving. Despite its water resistance, it's best to avoid unnecessary exposure to water for watches with this marking. This water resistance rating can be found, for example, in the Korpi and Harju wristwatches made from Finnish birch.
10 ATM / 10 bar / 100 m
A watch with a 10 ATM rating is significantly more water-resistant than lower ratings and is designed for use in water. It can be worn while swimming or playing water sports. However, for deep-sea diving, it's advisable to use a watch with a stronger water resistance rating.
20 ATM / 20 bar / 200 m
A watch with a 20 ATM rating is designed to be used in water. It can withstand activities like recreational diving and other water sports. With the exception of professional saturation diving, a watch with this water resistance rating can be used in any water activity.
As mentioned earlier, a watch's water resistance relies on seals within the watch that prevent water from entering. Even if a watch is water-resistant, it's best to avoid exposing it to significant temperature changes. A good example of this is wearing a watch in a sauna. After being exposed to high heat in the sauna, the sudden cold air or a shower can subject the watch to such significant temperature changes that the seals may not hold up. This could lead to moisture damage, even in a watch with a high water resistance rating.
It's essential to familiarize yourself with your watch's water resistance and use it accordingly. While it's crucial to handle watches with care around water, there's no need for unnecessary worry - watches are meant to be worn. With these guidelines and tips, you can use your watch confidently within its water resistance limits.
All HAVU watches are protected from splashes and dust with water resistance ratings of 3 ATM or 5 ATM. You don't need to worry about getting them wet during normal use. For example, you don't need to remove them when washing your hands or in light rain. However, when going to the sauna or swimming, it's advisable to leave the watch on the table.