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WITH its new WSD-F21HR, Casio has incorporated a heart-rate sensor for the first time to tempt those who have donned Garmins or Fitbits. Like all of Casio's tough watches, the F21HR is still the Hulk of wearables. Garmin Fenix wearers might scoff at it, but dainty Fitbit wearers will be in for a...