There are two potential sources of inaccuracy with an HRM.
The first is that the HRM is not counting your heart rate accurately.
The second is that your heart rate diverges in some way from the 'average'. The equations that convert your heart rate into a calorie burn are based on broad population averages. And like most averages, they are a pretty good estimate for 1/3 of the population, somewhat useful for another 1/3 and less useful for another 1/3. High blood pressure and some medications can lead to an increased heart rate over what the exercise itself justifies, other medications (eg. beta blockers) lead to a lower heart rate.
If the inaccuracies of your HRM are due to the first cause, then a different HRM may well measure more accurately.
But given that most of the heart rate/calorie equations come out of the same basic research, switching to a different HRM is unlikely to fix inaccuracies due to the second cause.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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