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If you don't want to wait, we launched a study with UCSF Cardiology which showed 97% accuracy at detecting atrial fibrillation in May:

https://itunes.apple.com/us/app/cardiogram/id1000017994?ls=1... cnbc.com/2017/05/11/apple-watch-uses-cardiogram-to-screen-for-heart-rhythm-abnormalities.html

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So the Apple Watch is in an accurate heart rate monitor? Or is high precision not needed for testing for this abnormality? I want highly accurate rate monitoring throughout the day, especially on long hikes.

I've found mine is accurate as long as it is snug. But if it's not snug, it can be way off.

Also, when I first tried it I had wrist pain, and learned that I actually was "wearing it wrong". Moving it further up my arm fixed it, and now it's literally my favourite device.

Hrmm. I'll await the in depth reviews. For now, my chest strap will keep monitoring for me.

I'm talking about Series 2. Series 3 isn't available yet. But Series 3 is supposedly same size as Series 2, except the thing that sticks out of the back is "2 sheets of paper thicker", to use Apple's new contribution to the imperial system :)

So my guess is it will be the same: just as good as my Polar chest strap when snug, and off when, well, off.

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