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Does the heart rate monitor not read through tattoos

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I have a sleeve and the heart rate monitor and the sleep tracking don't work. Is it because of my tattoos??? 

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Hmm that's very possible, tattoo ink is metal and the higher the saturation of ink makes it harder for the optical sensors to see through your skin. This may sound a bit batty but you could try putting the fitbit on your ankle or any other area that doesn't have a tattoo just to test? Also do you get an HR reading while awake? I am also suspecting it could be a hardware/software issue. If your Fitbit is new then give it time to read info for a couple of days.

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Heart rate uses the Green light, the Oxygen sensor uses both Red and Infrared light. 

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