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Helpful answers
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Sep 30, 2015 7:45 AM in response to Whitelinesby thunderzzz,As far as I know Apple watch lags if the owner has tattoos on the wrist.
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Sep 30, 2015 8:08 AM in response to Whitelinesby Phil0124,There are issues with tattoos and the Apple watch mainly due to the composition of the inks used in Tattoos.
Apple states as much:
Permanent or temporary changes to your skin, such as some tattoos, can also impact heart rate sensor performance. The ink, pattern, and saturation of some tattoos can block light from the sensor, making it difficult to get reliable readings.
From:
Your heart rate. What it means, and where on Apple Watch you’ll find it. - Apple Support