In the decade or so they’ve existed, smart rings haven’t experienced the same explosion in popularity as other wearable tech — size constraints make developing good smart rings to sell at reasonable prices a tall order. Oura’s been making smart rings since 2015, and the Oura Ring, now in its third iteration, is one of the most refined and popular options today. ANDROIDPOLICE VIDEO OF THE DAYSCROLL TO CONTINUE WITH CONTENT It’s expensive, and the form factor is still limiting compared to a smartwatch, but Oura’s experience shows: the Oura Ring Generation 3 is the best smart ring you can buy today. But whether that will translate to a good…