In the world of wearable health technology, accuracy is paramount. Consumers rely on these devices to monitor vital health metrics accurately, making the comparison between different models crucial. Today, we examine two popular smartwatches: the Scanwatch 2 and the Polar Grit X Pro, focusing on their health tracking accuracy.

Overview of the Devices

The Scanwatch 2, developed by Withings, is known for its hybrid design combining traditional watch aesthetics with advanced health sensors. It offers features such as heart rate monitoring, ECG, and SpO2 tracking. The Polar Grit X Pro, on the other hand, is a rugged sports watch tailored for outdoor enthusiasts, boasting precise GPS, heart rate monitoring, and sleep tracking capabilities.

Heart Rate Monitoring Accuracy

Heart rate accuracy is a critical metric for many users. In various tests, the Scanwatch 2 demonstrated reliable readings during rest and moderate activity. Its optical sensor provided readings within 3 beats per minute (bpm) of chest strap measurements in most cases.

The Polar Grit X Pro, equipped with Polar’s proprietary Precision Prime sensor technology, showed high accuracy during intense workouts. It maintained a deviation of less than 2 bpm compared to chest strap data, especially during high-intensity interval training (HIIT).

Sleep Tracking Performance

Sleep tracking accuracy varies among devices. The Scanwatch 2 offers detailed sleep analysis, including REM, deep, and light sleep stages. It closely matched polysomnography data in controlled studies, with an average error of 10 minutes in total sleep time.

The Polar Grit X Pro also provides comprehensive sleep metrics. Its algorithms effectively detect sleep stages, but some users reported overestimating deep sleep duration by up to 15 minutes. Nonetheless, both devices provide valuable insights for general sleep health monitoring.

GPS and Outdoor Activity Tracking

For outdoor activities, GPS accuracy is vital. The Polar Grit X Pro’s GPS module is highly precise, with errors typically under 5 meters during runs and hikes. It maintains signal lock even in challenging environments.

The Scanwatch 2 lacks built-in GPS but can connect to a smartphone’s GPS. Its accuracy depends on the phone’s signal quality, which can introduce some discrepancies in distance and route tracking.

SpO2 and Blood Oxygen Monitoring

The Scanwatch 2 features SpO2 sensors capable of measuring blood oxygen saturation. Its readings are consistent with medical pulse oximeters during resting states, with deviations of less than 2%. This makes it suitable for detecting potential respiratory issues.

The Polar Grit X Pro does not include SpO2 monitoring, focusing more on fitness and outdoor tracking features. Users seeking blood oxygen data will find the Scanwatch 2 more comprehensive in this regard.

Conclusion

Both the Scanwatch 2 and Polar Grit X Pro excel in different areas of health tracking accuracy. The Scanwatch 2 offers reliable heart rate, sleep, and SpO2 measurements, making it suitable for health-conscious users seeking comprehensive monitoring. The Polar Grit X Pro provides highly accurate GPS and heart rate data during outdoor activities, ideal for athletes and adventurers.

Choosing between them depends on individual needs: for overall health tracking, the Scanwatch 2 is a strong contender; for outdoor performance and activity tracking, the Polar Grit X Pro stands out.