How to interpret water resistance (ATM) – avoid costly mistakes
When you buy a new watch, it often says “Water resistance: 5 ATM” or similar in the specifications – but what does that really mean? Is it waterproof enough to swim with? Can you shower with it? Here we explain what water resistance (ATM) actually means – so you don’t accidentally ruin your watch.
What does ATM mean?
ATM stands for atmospheric pressure. 1 ATM is approximately the pressure at a depth of 10 meters. But – and this is important – this does not mean that you can dive 10 meters with a watch marked 1 ATM! The values apply under laboratory conditions and do not take into account movement, temperature or time in water.
| Marking | Water safety | Recommended use |
|---|---|---|
| 3 ATM | Withstands splashes and rain | Hand wash, light rain – no shower or bath |
| 5 ATM | Shower resistant | Short shower, wash hands – no swimming |
| 10 ATM | Water resistant | Swimming, beach activities, water play |
| 20 ATM | Waterproof | Snorkeling, water sports, not diving |
| 30 ATM+ | Diving bell | Professional diving with pressure changes |
Are you going swimming or diving? Look for:
- Screwed crown – provides extra sealing
- Rubber or resin bracelet – more water resistant than leather
- Solar clock movement – perfect for outdoor activities
Find the right watch for your lifestyle
At Kronura you will find a wide selection of watches with different water resistance levels – from stylish everyday models with 3 ATM to robust sports watches with 20–30 ATM. We are happy to help you find the right one, whether you are looking for something for the office, the beach or your next adventure.
