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  • Fitness trackers don't always count well
  • Fitness trackers don't always count well
    TechStage (2014) ©
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Fitness trackers don't always count well

Fitness trackers have become trusted companions in our quest for self-improvement, with global sales for wearables projected to reach $275 million in 2016. But when scientists compared 12 devices against controlled methods of calorie counting, they found these gadgets aren't always accurate.

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