Watch Water Resistance Explained 3 ATM, 5 ATM, 10 ATM

When choosing a watch, water resistance is one of the most important features to understand. You’ll often see ratings like 3 ATM, 5 ATM, or 10 ATM — but what do they really mean?

What Does “ATM” Mean?

ATM (atmospheres) refers to the pressure a watch can withstand. 1 ATM ≈ pressure at 10 meters (33 feet) of water.

However, these ratings are tested in static laboratory conditions, not real-life movement.

3 ATM / 30M Water Resistant

Suitable for:

• Daily wear

• Hand washing

• Light rain

Not suitable for:

• Swimming

• Showering

• Submerging in water

Best for office or casual watches.

5 ATM / 50M Water Resistant

Suitable for:

• Hand washing

• Rain

• Showering

• Light splashes

Not suitable for:

• Swimming

• Diving

Good for everyday active use.

10 ATM / 100M Water Resistant

Suitable for:

• Swimming

• Snorkeling

• Water sports

Not suitable for:

• Scuba diving

• High-pressure water

Ideal for sports and outdoor watches.

Important Tips

• Water resistance is not permanent — seals age over time.

• Avoid pressing buttons underwater.

• Hot water and steam (showers, saunas) can damage seals.

Quick Reference Table

At MEGIR, most models offer 3–10 ATM water resistance, making them reliable for both daily wear and active lifestyles.