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You love your mechanical watch. You also want to track your sleep, heart rate, and workouts without strapping a second device to your other wrist or giving up the watch you carefully curated. This is the tension that has defined watch collecting for the last …
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If you buy something from a link in this article, we may earn a commission. Learn more You love your mechanical watch. You also want to track your sleep, heart rate, and workouts without strapping a…