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HRM Dual - bluetooth

I own a Vivosmart HR+ which unfortunately is very inaccurate when measuring my heart rate during a HITT session (reads very low) so would like to use a chest strap to get an accurate reading. Unfortunately my Vivosmart HR+ isn't compatible with ANT+ so i'm considering purchasing the  HRM Dual and pairing via bluetooth. My question is how does it work e.g. if I pair the devices and then open a 'cardio' activity will the wrist strap take the heart rate from the chest strap and the calculate calories etc as usual? If not, how would I save the heart rate from the chest strap?

Thanks in advance for any replies.

Phil