A waterproof ECG smartwatch is better described as a water-resistant ECG smartwatch: the useful question is not whether the marketing says “waterproof,” but what the published IP or ATM rating actually covers and what the manufacturer recommends for swimming, showering and everyday water exposure.
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What Do IP67 and IP68 Mean on an ECG Smartwatch?
IP ratings describe resistance to solid-particle ingress and water ingress under defined test conditions. The first digit covers dust protection; the second digit covers water protection. IP67 and IP68 therefore both indicate strong dust protection plus different levels of tested water resistance.
What the code does not tell you by itself is whether the manufacturer approves swimming, hot showers, diving or repeated button presses underwater. Those use cases add motion, heat, soap, chlorine, salt and pressure changes that are different from a laboratory ingress test.
For buyers, the safest rule is simple: rating + manufacturer instructions beats the word “waterproof.” If the product page says rain and hand-washing are fine but swimming is not recommended, follow that guidance even if the watch carries IP68.
REXQU ECG Smartwatch Water Ratings Compared
The table below focuses on current REXQU models whose static product pages clearly publish an IP rating. It deliberately avoids guessing when a use case is not specifically approved.
| Model | Published rating | Everyday water exposure | Swimming / shower guidance |
|---|---|---|---|
| CardioSense | IP67 | Rain, sweat, hand-washing | Not positioned as a swim watch; check current instructions |
| HealthLink | IP68 | Rain, sweat, hand-washing | Follow current product instructions rather than assuming IP68 means swimming |
| IntelliFit | IP68 | Rain, sweat, hand-washing | Not marketed as a dedicated swim/dive watch |
| O2Max | IP67 | Rain, sweat, hand-washing | Not positioned as a swim watch |
| CardioCall | IP67 | Rain, sweat, splashes | Check current manufacturer guidance before showering or swimming |
| Infinity Pro | IP67 | Rain, sweat, hand-washing | Current REXQU guidance says keep it out of the pool and shower |
If swimming itself is the priority, do not choose an ECG watch simply because it says IP68. Start with a model whose manufacturer explicitly approves the intended water activity. REXQU’s 5ATM smartwatch-for-swimming guide explains why an ATM swim rating is a different shopping question from IP67/IP68 everyday protection.
How to Choose a Water-Resistant ECG Smartwatch
Use this order rather than simply picking the highest IP number:
- Decide the actual water use. Rain and sweat are very different from pool laps, hot showers or open-water swimming.
- Check the published rating. IP67/IP68 are useful for everyday protection; an ATM swim rating addresses a different type of pressure test.
- Read the model-specific instructions. Manufacturer guidance overrides assumptions based on the code alone.
- Compare the ECG features separately. Water resistance does not tell you anything about ECG display size, recording workflow, battery or app experience.
- Choose by your main use case. CardioSense emphasizes a large ECG display, HealthLink blends ECG into daily health tracking, Infinity Pro adds SOS/flashlight features, and other models serve different priorities.
How to Protect Water Resistance Over Time
- Dry the watch and charging contacts before charging.
- Rinse off salt, sweat or chlorine only when the manufacturer’s care instructions permit it.
- Avoid hot tubs, saunas and steam unless specifically approved.
- Do not assume an old or damaged seal performs exactly like a new one.
- After a hard impact, be more cautious around water even if the case looks fine.
Waterproof ECG Smartwatch FAQs
Can I shower with an IP67 ECG smartwatch?
Do not assume so. IP67 indicates tested ingress resistance, but hot water, soap and repeated exposure are separate considerations. Follow the product’s current shower guidance.
Is IP68 better than IP67?
IP68 represents a higher water-ingress test category, but “better” depends on the activity. It still does not automatically turn a watch into a swimming or diving watch.
Does IP68 mean I can swim with the watch?
Not automatically. Look for explicit manufacturer approval for swimming or an appropriate swim-oriented ATM rating.
Does water resistance affect ECG accuracy?
The rating itself does not improve ECG accuracy. For a clean recording, the watch and skin should generally be dry and the user should remain still during the on-demand ECG.
Which REXQU ECG watch should I compare first?
Start with the Best ECG Smartwatch buying guide, then open the individual static product pages for the models that match your water, display and feature requirements.
Bottom Line
When shopping for a waterproof ECG smartwatch, treat “waterproof” as shorthand and verify the actual rating. IP67 and IP68 are useful everyday protections, but neither automatically means swimming or showering is approved. Choose the ECG watch for its heart-tracking and usability first, then make sure its water guidance matches your routine.
Browse REXQU ECG Smartwatches →
For a deeper comparison of ECG features, see the REXQU ECG Smartwatch Buying Guide.
This article is informational and reflects published product specifications. REXQU smartwatches are consumer wellness devices, not diagnostic medical devices.