The FDA has only approved one medical wearable that provides continuous oxygen saturation (SpO2) and pulse rate tracking: the Masimo W1 Medical watch. “If you really want a wearable that’s going to help you manage your health, the accuracy of that signal has got to be at the highest caliber,” says Omar Ahmed, executive vice president of engineering at Masimo. The device gives medical-grade accuracy a cut above most fitness trackers, monitoring the perfusion index of a person, or how well blood is circulating, alongside SpO2 and pulse rate. Tracking each of these every second, the W1 records 70,000 measurements a day—critical for those with chronic conditions.
Buy Now: Masimo W1 Medical on Masimo
More Must-Reads from TIME
- How the Electoral College Actually Works
- Your Vote Is Safe
- Mel Robbins Will Make You Do It
- Why Vinegar Is So Good for You
- The Surprising Health Benefits of Pain
- You Don’t Have to Dread the End of Daylight Saving
- The 20 Best Halloween TV Episodes of All Time
- Meet TIME's Newest Class of Next Generation Leaders
Contact us at letters@time.com