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Health tracking guides

Plain-English buying guides, explainers and how-tos for wireless earbuds, headphones, neckbands and smartwatches.

ExplainerHealth tracking
Smartwatch Sensors: Heart Rate, SpO2, Sleep and Steps

How the heart-rate, SpO2, motion and GPS sensors in a smartwatch work, what affects their accuracy and how to read the numbers sensibly. Readings are for general wellness,...
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