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CBS News has uploaded Which fitness tracker is the most accurate? Which fitness tracker is the most accurate? CBS News A new study is questioning the accuracy of some popular wearable fitness trackers. The Cleveland Clinic research found heart rate readings could be off by between 30 and 40 beats per minute. CBS News medical contributor Dr. Tara Narula joined CBSN to discuss which tracker is most reliable. © 2016 YouTube, LLC 901 Cherry Ave, San Bruno, CA 94066 You were sent this email because you chose to receive updates from CBS News. If you don't want these updates anymore, you can unsubscribe here.