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Title: Polar A3 is on-target
Review: I owned a simple Polar heart rate monitor a few years ago and always wished that it had a watch function. I was delighted when I noticed the A3. I wanted a very simple HRM, and the A3 fit the bill. It has even more functions than I need. But I'm very pleased with how it works. Just set your age and it automatically calculates your target heart rate. I found that my perceived exertion exceeded my actual heart rate! Like other reviewers, the only change I would want for the Polar A3 is the battery -- I'd like to be able to change it myself.
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