HR shows 117, but ECG app says it won't work because my HR is 135?

[Vaelayne]

I was just doing dishes and it suddenly felt like my heart was racing really fast, but my heart rate was only showing as 117 on the Fitbit. So I decide to try the ECG app, see if has anything to say, and I get the message that it won't work because my heart rate is 135. Double check, and the Fitbit is still saying only 115.

What gives? Is one of these sensors just wildly inaccurate? The only reason I bought this thing was to monitor my heart rate for biofeedback for stress management (I do appreciate the other features, but still ...)

[Rufous44]

Yes, the HR sensor of Sense is essentially a random number generator.

[Rich_Laue]

So when you checked your pulse, with a second hand and your fingers, what was it?