And it will be ready on the Sense in October

Fitbit has received clearance for the use of its ECG app in the US and Europe, ahead of the launch of the Fitbit Sense.

The Fitbit Sense is the company’s first health watch and is set to be released on 25 September, and debuts the use of electrocardiogram on a Fitbit device.

And Fitbit says that the feature will land on the Fitbit Sense in October 2020, in the US and UK as well as most European countries and India.
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https://www.wareable.com/fitbit/fitbit-sense-ecg-clears-fda-ahead-of-launch-8084