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Polar
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Polar M21 Heart Rate Monitor

The Polar M21 and M22 heart rate monitors are identical except fot the color of the watch casing. Both are able to automatically pick the safest and most efficient heart rate zone limits for you as you warm up. The M21 and M22 are ideal weight loss tools because they can quantify the number of calories you burned and further tell you how many of those calories came from fat.



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