Respuesta :
Pe.dometer would be the most useful to you for monitoring heart rate. A pe.dometer is a gadget, typically convenient and electronic or electromechanical, that tallies each progression a man takes by distinguishing the movement of the individual's hands or hips.
A technological device which would be the most useful for monitoring a person's heart rate is: D. pedometer.
What is a pedometer?
A pedometer can be defined as technological device that is designed and developed to record and estimate the distance a person travels on foot, especially by keeping count of the number of steps taken.
This ultimately implies that, a pedometer is a technological device which would be the most useful for monitoring a person's heart rate.
Read more on pedometer here: https://brainly.com/question/9776399
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