The best replacement for polar rc3 is rcx3.

The best alternatives to polar rc3 are rated as following:
★★★★★  rcx3
★★★  garmin 220
★★★  garmin 620
★★★  garmin 610
★★★  garmin 310xt
★★  garmin 210
★  garmin 910
★  suunto ambit

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polar rc3
rcx3
garmin 220