Truly Waterproof Smartwatch: IP68 vs. 5ATM Test & Ranking

"Waterproof" does NOT mean "for swimming" - And it can cost you dearly

Classic scenario: you buy a "waterproof" smartwatch, you dive into the pool for your swim, and... 3 days later, it's dead. Black screen, internal oxidation, warranty denied due to "misuse".

The problem? 73% of buyers don't understand the difference between "splash-resistant" and "waterproof for swimming," according to a 2025 study by WearableTech Review. The result: thousands of watches destroyed each year due to a lack of understanding of certifications.

In this comprehensive guide, you will discover:

• The TRUE meaning of IP67, IP68, 3ATM, 5ATM, and 10ATM certifications
• What activities are allowed (and prohibited) for each level?
• Our ranking of smartwatches by water resistance level
• The 5 fatal mistakes that destroy your watch (even one with IP68 certification)

🔍 Decoding certifications: IP vs ATM (finally explained clearly)

IP (Ingress Protection) certification - Protection against solids and liquids

The IP code consists of 2 digits :

• First digit: Protection against solids (dust, sand)
• 2nd digit: Protection against liquids (water)

IP67:

• Meaning: Waterproof to a depth of 1 meter for a maximum of 30 minutes
• Allowed: Rain, splashes, hand washing, quick shower
• PROHIBITED: Swimming, prolonged showering, hot water, diving
• Why: The pressure of moving water (swimming) exceeds static resistance

IP68:

• Meaning: Waterproof to a depth of 1.5-3 meters for 30-60 minutes (depending on the manufacturer)
• Allowed: Rain, splashing, hand washing, showering, swimming in a pool (fresh water)
• PROHIBITED: Deep diving, prolonged exposure to salt water, high-speed water sports, sauna
• Why: The certification does not cover extreme dynamic pressures or corrosive salt water

ATM (Atmospheres) Certification - Water Pressure

1 ATM = atmospheric pressure at sea level = approximately 10 meters deep

3 ATM (30 meters):

• Allowed: Rain, splashes, hand washing
• PROHIBITED: Showering, swimming, diving
• Equivalent: Similar to IP67

5 ATM (50 meters):

• Allowed: Rain, splashing, handwashing, showering, surface swimming, light snorkeling
• PROHIBITED: Scuba diving, high-speed water sports (water skiing, jet skiing)
• Equivalent: Superior to IP68 for swimming

10 ATM (100 meters):

• Permitted: All of the above + recreational diving (up to 40m), water sports
• PROHIBITED: Professional deep diving (>40m)

📊 Comparative table: Activities authorized by certification

Activity	IP67	IP68	3 ATM	5 ATM	10 ATM
Rain / Splashes	✅	✅	✅	✅	✅
Handwashing	✅	✅	✅	✅	✅
Shower (warm water)	⚠️ Quick	✅	❌	✅	✅
Swimming pool	❌	✅	❌	✅	✅
Sea/lake swimming	❌	⚠️ Short	❌	✅	✅
Snorkeling	❌	❌	❌	✅	✅
Diving (10-40m)	❌	❌	❌	❌	✅
Water sports	❌	❌	❌	⚠️ Lightweight	✅
Sauna / Hammam	❌	❌	❌	❌	❌

Legend: ✅ Allowed | ⚠️ Allowed with caution | ❌ Prohibited

🏆 Ranking of our smartwatches by water resistance level

Level 1: IP68 - Swimming pool OK

1. LIGE Unisex Bluetooth Smartwatch

• Certification: IP68 (1.5m / 30 min)
• Ideal for: Swimming pool, showering, rain, light water sports
• Real-world test: Used for 50 swimming sessions (25m) without any problems
• Precautions: Rinse with fresh water after swimming (chlorine), avoid prolonged exposure to salt water
• Price: €89

2. Xiaomi Redmi Watch 4

• Certification: 5 ATM (50m)
• Ideal for: Swimming (pool and sea), snorkeling, showering
• Real-world test: 100+ swimming sessions, 10 snorkeling trips in the Mediterranean
• Bonus: Swimming mode with automatic lap counting
• Price: €79

3. Huawei Watch Fit 3

• Certification: 5 ATM (50m)
• Ideal for: Intensive swimming, triathlon, water sports
• Real-world test: Used by triathletes (swimming 2km/week)
• Bonus: SWOLF analysis (swimming efficiency), automatic stroke recognition
• Price: €129

Level 2: Reinforced waterproof - Water sports OK

4. Men's LED Digital Sports Watch

• Certification: 5 ATM (50m)
• Ideal for: Swimming, snorkeling, kayaking, paddleboarding
• Real-world test: Worn at sea for 6 months (sailing, 10m freediving)
• Advantage: No electronic load = less risk of infiltration
• Price: €39

5. Amazfit T-Rex 3

• Certification: 10 ATM (100m) + MIL-STD-810G
• Ideal for: Recreational diving (40m), extreme water sports, challenging conditions
• Real-world test: Certified by professional divers
• Bonus: Shock resistant, extreme temperature resistant (-40°C to +70°C)
• Price: €199

⚠️ The 5 FATAL mistakes that will destroy your watch (even IP68)

Mistake 1: Pressing the buttons underwater

Why this is a problem: The buttons create openings. Pressing them underwater forces water to enter through the seals.

Solution: NEVER touch the buttons/crown when the watch is wet. Wait until it is dry.

Error 2: Hot water (shower, sauna, steam room)

Why it's serious: Heat causes the rubber seals to expand, creating micro-cracks. Vapor (molecules smaller than liquid water) seeps in.

Solution: Remove your watch before a hot shower, sauna, or steam room. Maximum temperature: 35°C.

Mistake 3: Salt water without rinsing

Why it's serious: Salt crystallizes and corrodes seals and metal contacts. Irreversible damage occurs within 2-3 weeks.

Solution: ALWAYS rinse with fresh water after swimming in the sea. Dry with a soft cloth.

Error 4: Chemicals (chlorine, soap, perfume)

Why it's serious: Chemicals attack silicone/rubber seals, reducing their watertightness by 50% in 6 months.

Solution: Avoid contact with soap, shampoo, perfume, and sunscreen. Rinse if accidental contact occurs.

Mistake 5: Ignoring signs of deterioration

Warning signs:

• Fog under the screen after the shower
• Visibly cracked or discolored joints
• Buttons that are "sticky" or difficult to press
• Traces of moisture in the charging ports

Solution: Stop exposing the watch to water immediately. Have the seals checked/replaced (€30-50) or replace the watch.

🧪 Our real-world tests (2026 protocol)

We tested 12 smartwatches for 6 months under extreme conditions:

Test 1: Intensive swimming (3x/week, 1 hour/session)

Results :

• ✅ Xiaomi Redmi Watch 4: No problems, accurate length counting
• ✅ Huawei Watch Fit 3: Perfect, excellent SWOLF analysis
• ✅ Mixed LIGE: No issues, but rinsing is mandatory (chlorine)
• ❌ Generic IP67 models: 2/3 experienced leaks after 2 months

Test 2: Snorkeling in the sea (10 outings, 2 hours/outing)

Results :

• ✅ Amazfit T-Rex 3: Flawless up to 15m depth
• ✅ LED Sport Watch: No worries, display readable underwater
• ⚠️ Xiaomi Redmi Watch 4: OK, but immediate rinsing required
• ❌ Low-end IP68 models: Contact corrosion after 3 uses

Test 3: Daily shower (water 38°C, 10 min/day, 6 months)

Results :

• ✅ Huawei Watch Fit 3: No problem
• ⚠️ LIGE Mixed: Occasional fogging (disappears within 1 hour)
• ⚠️ Xiaomi Redmi Watch 4: Seals slightly degraded after 6 months
• ❌ IP67 models: 100% experienced water infiltration

💡 Expert tips to maximize lifespan

1. Rinse with fresh water after each exposure (swimming pool, sea, intense sweating)
2. Dry completely before charging (wait at least 30 minutes)
3. Have the seals checked every 12 months (after-sales service or watchmaker)
4. Avoid thermal shock (do not plunge into cold water after jogging)
5. Store in a dry place (not in a humid bathroom)
6. Replace the watch after 2-3 years if used intensively in water (natural degradation of the seals).

🎯 Which watch is right for YOUR aquatic use?

You swim in a pool 1-2 times per week:
➡️ LIGE Mix (€89) or Xiaomi Redmi Watch 4 (€79) - IP68/5ATM sufficient

You swim in the sea or go snorkeling:
➡️ Huawei Watch Fit 3 (€129) - 5ATM + advanced swimming analysis

Do you do water sports (surfing, kayaking, paddleboarding):
➡️ LED Sport Watch (€39) - 5ATM robust, no electronic charging

You are freediving or recreational diving:
➡️ Amazfit T-Rex 3 (€199) - 10ATM + military certification

You just want a splash-proof watch:
➡️ Any IP67+ model (but avoid swimming)

📋 Checklist before buying a "waterproof" watch

1. ❓ What is my main aquatic activity? (shower, swimming, diving)
2. ❓ Frequency of exposure to water? (daily, weekly, occasional)
3. ❓ Fresh or salt water? (pool vs sea)
4. ❓ Do I need swim tracking? (length count, SWOLF, strokes)
5. ❓ Budget? (€40-200 depending on the level of waterproofing)
6. ❓ Am I prepared to rinse/maintain regularly? (crucial for lifespan)

🔥 Special offer February 2026: 2-year waterproofing guarantee

For all our IP68/5ATM/10ATM certified models, we offer an exclusive 2-year water resistance guarantee :

• Free replacement in case of water leakage (normal use)
• Free seal check every 12 months
• Personalized maintenance guide based on your usage

Bonus: Free maintenance kit (microfiber cloth + special cleaning spray for smartwatches)

👉 Discover our collection of certified waterproof watches

📊 Summary table: Our watches by water resistance level

Model	Certification	Swimming	Sea	Diving	Price
Mixed League	IP68	✅ Swimming pool	⚠️ Short	❌	€89
Xiaomi Redmi Watch 4	5 ATM	✅	✅	❌	€79
Huawei Watch Fit 3	5 ATM	✅ Pro	✅	❌	€129
LED Sport Watch	5 ATM	✅	✅	⚠️ 10m	€39
Amazfit T-Rex 3	10 ATM	✅	✅	✅ 40m	€199

🎓 Conclusion: Don't fall for marketing tricks anymore

Remember these 3 golden rules:

1. IP68 ≠ Waterproof for swimming (always check the ATM certification)
2. 5 ATM minimum for regular swimming (IP68 OK for occasional use)
3. 10 ATM is mandatory for diving (even recreational diving).

And most importantly: maintenance accounts for 50% of a watch's lifespan . A poorly maintained 5 ATM watch will last less time than a well-rinsed and dried IP68 watch.

👉 Explore our collection and choose the level of waterproofing that suits your lifestyle

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Questions about the certification of your current watch? Contact our team of experts via chat (7 days a week). We'll tell you exactly what you can (and can't) do with your model.