What is the best heart rate and heart variability portable device to best measure listening effort?

26 April 2020 0 6K Report

I'm looking for a portable device to best measure heart rate and heart rate variability (HRV) for listening effort research. I own Emay bluetooth pulse oximeter which can measure heart rate for long periods and without any intervals. Unfortunately, tried to connect it with "elitrhrv" app that measures HRV without a success.

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