Complete Guide to Watch Water Resistance – Minutimer
At Minutimer , we know that a water-resistant watch is more than just its design. Water resistance is crucial to protecting your watch from water, whether for everyday wear, swimming, snorkeling, or diving. This comprehensive guide explains each water resistance rating (ATM) and the recommended uses for each watch.
What is the water resistance of a watch?
A watch's water resistance rating indicates its resistance to water, measured in ATM (atmospheres) or meters. 1 ATM corresponds to atmospheric pressure at sea level. Note: these tests are performed under static conditions. In real-life use, movement or temperature variations can increase the pressure on the watch.
Why ATM is important for your watch
Understanding ATM (Anterometric Temperature) allows you to choose a water-resistant watch suited to your activities. At Minutimer , we explain the limits of each level and how to use them safely.
3 ATM Watches – Waterproof Watch for Everyday Life
A 3 ATM watch is resistant to light splashes and rain. It is suitable for everyday use.
- Daily wear
- Splashes and light rain
- Quick hand washes
⚠️ Caution: Do not immerse in water, avoid showering or bathing. A 3 ATM watch is not designed for swimming.
5 ATM Watches – Waterproof watch for light swimming
A 5 ATM watch offers moderate resistance and can be worn for:
- Prolonged hand washing
- Quick shower (caution)
- Surface swimming and light swimming
⚠️ Caution: Avoid diving and intense water sports. Ideal as a waterproof watch for occasional swimming .
10 ATM Watches – Waterproof Watch for Swimming and Snorkeling
A 10 ATM watch is suitable for regular swimming and snorkeling:
- Surface swimming
- Snorkeling and moderate water sports
- Light diving without tanks
⚠️ Caution: Avoid deep diving and extreme water sports. Always check the manufacturer's recommendations.
20 ATM Watches – Waterproof Watch for Recreational Diving
A 20 ATM watch is suitable for recreational diving and advanced water sports:
- Advanced freediving and snorkeling
- Deep water swimming
- Intensive water sports
⚠️ Caution: Even though it is water-resistant to 200 meters, remain cautious during professional diving. Regularly check the condition of the seals and crowns.
Watches 30 ATM and above – Waterproof watch for professional diving
Watches rated 30 ATM and above are designed for professional diving and extreme water sports:
- Scuba diving
- Extreme water sports
- Extended underwater activities
⚠️ Caution: always check ISO certifications. Even with a 30 ATM watch, it is recommended to have the water resistance checked regularly.
Summary table of watch water resistance
| ATM | Depth / Pressure | Recommended use | Precautions |
|---|---|---|---|
| 3 ATM | 30 meters | Daily wear, rain, splashes | No swimming or diving |
| 5 ATM | 50 meters | Light swim, quick shower | No diving or intense water sports |
| 10 ATM | 100 meters | Swimming, snorkeling | No deep diving |
| 20 ATM | 200 meters | Recreational diving, advanced water sports | Caution for professional diving |
| 30+ ATM | 300 meters and more | Professional diving, extreme water sports | ISO verification and regular checks |
Tips to extend the life of your waterproof watch
- Avoid operating the buttons underwater unless otherwise instructed.
- Rinse your watch after exposure to salt or chlorinated water.
- Have the seal checked every 1-2 years.
- Respect the depth and ATM limits for each use.
- Avoid extreme temperature variations.
FAQ – Frequently asked questions about watch water resistance
Which watch should I choose for swimming?
For swimming, we recommend a 5 ATM or 10 ATM watch . A 5 ATM watch is suitable for light swimming and quick showers, while a 10 ATM watch allows for safe swimming and snorkeling.
Can a 3 ATM watch withstand rain?
Yes, a 3 ATM watch is splash and rain resistant. However, it should not be submerged or used in the shower or bath.
Which watch is suitable for snorkeling?
For snorkeling, choose a watch with a 10 ATM or 20 ATM rating . A 10 ATM watch is sufficient for swimming and light snorkeling, while a 20 ATM watch is suitable for recreational diving and more demanding water sports.
How can I tell if my watch is suitable for professional diving?
Watches rated to 30 ATM and above are designed for professional diving. Always check for ISO certifications and have the water resistance tested regularly to ensure optimal protection.
Can a waterproof watch be used in hot water?
It is not recommended to expose a watch to hot water, even if it is water-resistant. Heat can cause the seals to expand and reduce water resistance, even on a watch rated at 10 ATM or higher.
Conclusion – Choosing the right waterproof watch on Minutimer
Understanding your watch's water resistance is essential to protecting your investment and fully enjoying your activities. At Minutimer , we help you select the ideal water-resistant watch for everyday life, swimming, snorkeling, or professional diving. Follow our advice and enjoy your watch with complete confidence.