Heart rate monitors have been around long enough to be a reliable technology.
Polar has always been the industry leader.
If all you want is a readout, any basic model will do.
However, some features are useful for record keeping/tracking. Maximum HR, average HR, average HR in zones all give a better feedback and basis with which to compare to previous workouts.
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"To give anything less than your best is to sacrifice the Gift."
Steve Prefontaine
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