@Morebagpuss the manuals and guides can be found here https://help.fitbit.com/articles/en_US/manuals.htm (bottom of the page)
Important is to first check if your country is supported - see https://www.fitbit.com/global/us/technology/ecg
Go to the fitbit app on your smartphone - click on profile picture (top left) select sense under devices and then click on apps tile - the ecg app should be there under my apps if you have access - follow the instructions from the manuals
Best AnswerInteresting enough it just suddenly appeared on mine. I had looked for it when I first bought it and was pissed it wasn't available but I was scrolling through the other day and saw it had been installed somehow. I tried it and it worked. This was all a surprise since very little else on this **ahem** things works right.
Best Answer