Your experience with wrist-based (optical) heart rate technology is a personal one and depends even on the activity you are doing. Since optical HR measurement is based on reading the blood flow in your wrist, your own physiology will influence the results to a degree, including skin pigmentations (including tattoos). Temperature can also influence results as your body changes in cold or hot or wet weather. Learn more about the Suunto Spartan Sport Wrist HR at [ Ссылка ]

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