I have been satisfied with the Polar line, I purchased the lower and middle end of the price range. They all work the same for measuring the HR, the more you pay the more functions you get. I have also own a Omron which is lower cost with full clock functionality and has a replaceable battery compartment in the chest strap. However, I have found that if I am not using the Omron it is best to take the battery out, it must have a relatively high idle current draw and the battery will discharge in a couple of months. The Polar battery is not replaceable, but the straps in the past have lasted for more than a year each.
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