If you shop for sport watches, you will see ratings like "5 ATM", "10 ATM" or "50 m" on almost every product page. They sound simple, but they are easy to misunderstand. This guide explains what a 5 ATM rating really means and how to use your watch safely.
What is ATM?
ATM stands for atmospheres, a unit of pressure. A rating of 5 ATM (also written 5 BAR or 50 m) means the watch passed a laboratory pressure test equivalent to a static depth of 50 meters. It does not mean you can safely take the watch 50 meters underwater: movement, such as swinging your arm while swimming, creates more pressure than a still test.
What 5 ATM is good for
- Rain, splashes and sweat
- Washing your hands
- Light swimming in shallow water
- Everyday training and outdoor activities
What to avoid
- Diving and high-speed water sports such as jet skiing
- Hot water, saunas and steam, which can weaken the rubber seals
- Soap, shampoo, perfume and chemicals, which can degrade seals over time
- Pressing buttons underwater, because it can let water in around the pushers
How to look after water resistance
Water resistance is not permanent. Seals age with time, heat and impacts. After swimming in the sea or a pool, rinse your watch with fresh water and dry it with a soft cloth. If you notice fog inside the glass, stop using the watch in water and contact support.
Water resistance on the SMAEL 8136 Sonic Core
The SMAEL 8136 Sonic Core is rated 5 BAR (50 m), which is printed on the dial. It is built for rain, splashes and everyday activity. Our 2-year limited warranty covers eligible manufacturing defects under normal use.