I recently had a full heart work up at a place that had me hooked up to an EKG machine while on a treadmill. I had a Band on and compared the data over time and

I recently had a full heart work up at a place that had me hooked up to an EKG machine while on a treadmill. I had a Band on and compared the data over time and it was consistent the whole time within just a couple of bpm. I was extremely impressed by how accurate it was. It was only one day, but I left pretty confident in the data.