Be careful ! If you have a tattoo on your wrist (under the clock), then the clock DOES NOT COUNT the pulse. TK Heart rate sensors used in wrist gadgets are based on optical technologies. The LED shines through the skin through, and the optical sensor reads the indicators directly from the capillaries, the movements of which correspond to the pulse. A tattoo that clogs the skin pores interferes with the translucence of the skin and the recognition of capillaries.
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