Question about Fitbit Sense

Difficult to say how good it is, Fitbit itself states that:

General warnings and precautions

NEVER change your medication without consulting your doctor. For people who take
medications or substances that affect heart rate or blood flow, the results of heart rhythm
results of heart rhythm checks with the Fitbit ECG app may be inaccurate.

NEVER use this product instead of a treatment prescribed by your doctor.
Palpitations and shortness of breath can be symptoms of VHF. However, some people have
no symptoms at all, can be treated. So the sooner you find out, the sooner your doctor can do something about it.
doctor can do something about it.
If you have any symptoms related to VHF or concerns, talk to your doctor.
your doctor. False negative or false positive results due to a device or user error can occur.
user error can occur. A person with a false negative result could
delay seeking medical help and have persistent symptoms of VCF. A person
A person with a false positive result may have unnecessary additional testing or inappropriate behavioural or physical
Make inappropriate behavioural or physical changes. For more information about
For more information about the accuracy of the Fitbit ECG app, see "Clinical study" on page 13.

NEVER use for clinical diagnosis of VCF.

NEVER use for continuous, real-time or self-monitoring of heart rhythm.
This product CANNOT detect heart attacks, blood clots, strokes and other heart conditions.
The assessment performed by this product is NOT a diagnosis.
This product has NOT been tested on pregnant individuals.
This product is NOT intended for use in a clinical setting.

NEVER interpret or take clinical action based solely on the assessment result without
without consulting a qualified medical professional.

NEVER take an ECG reading when your wrist-worn Fitbit product is
outside the operating temperature or humidity range specified in the user manual for this device.
humidity range specified in the user manual for this device.

NEVER take a reading under water.
With VHF, your heart does not always beat irregularly, so it can be difficult to detect even in the doctor's office.
detect it.