The Apple Watch, heart rate sensors, and wrist tattoos: What you need to know!

[iMore.com]

Will an arm sleeve tattoo prevent you from wearing the Apple Watch? If it's a solid color, perhaps.
Recently, we've been hearing reports from Twitter and Reddit that the Apple Watch's plethysmograph sensor plays not-so-nicely with wrist or arm sleeve tattoos. The ink pigmentation interferes with the sensor's ability to read your heart rate ?*and with it, the Watch's ability to assess whether or not it's maintaining skin contact.

After some brief tests, we're inclined to agree with those early reports ?*if your tattoo happens to be a solid, darker color. This is has to do with the way Apple measures your heart rate. Let's break it down.

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