The technology is relatively rare outside of medical equipment, although Nokia does include an SpO2 sensor in its Pulse Ox wristband. Fitbit also says the Ionic's heart rate tracker is more ...

Fitbit Inspire 2 comes with features such as a heart-rate tracker, a sleep tracker, sedentary reminder, menstrual health tracker, guided breathing sessions and more than 20 exercise modes. READ ...

Learn more The list of the best Fitbit ... sensor, it offers real-time stress tracking via a cEDA sensor as well as an ECG app. The ECG app is especially interesting as it can track heart rhythms ...