Smart rings may be the next big thing in the wearables market and we just received the Ultrahuman Ring Air to see how it stacks up against the established smartwatches and smartbands. This is the lightest smart ring currently on the market ranging between 2-3 grams depending on the size you pick and it’s just 2.4mm thick – a lot less intrusive than a chunky smartwatch. Despite its slender frame, Ring Air promises the standard array of health-tracking features found on smartwatches including continuous heart rate, heart rate variability (HRV) and SpO2 monitoring. You also get detailed...

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