Fitbit updated the Alta a few weeks ago with a heart rate sensor, creating what it called the slimmest wrist-worn tracker of its kind. I’ve had the chance to play with the Alta HR for about a week, and yeah, it’s tiny. So much so that you wouldn’t look totally awkward wearing the Alta on one wrist and a traditional wristwatch on the other. Using it has been an overall pleasant experience. That it has a week of battery life is an impressive bit of engineering. In my testing, heart rate, steps, and sleep tracking were pretty much identical to the…
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