But if you’re looking for the most accurate heart rate tracker for cardio-based exercise like runs and walks, this will not be the best fit for you. During a leisurely outdoor walk with a few small hills, the Mi Band said my heart rate peaked at 180bpm — way higher than the number my chest strap said. There’s also no onboard GPS, which is not a surprise given this costs $45, so you will need to take your phone with you on workouts to record distance and route information. But that phone-assisted tracking is still a step up from the new $80 Amazon Halo View, which lacks any kind of distance tracking. I also needed to manually sync the band in the Mi Fit app every time I started a workout to get the GPS tracking to kick in, which was a bit annoying.
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