Polar S210 Heart Rate Monitor for sale online | eBay
Koen Delvaux's blog: Heartrate monitors and GPS for running: the Runkeeper-Magellan Echo dream combination that would beat Polar, Garmin, Tomtom and Suunto
The New Polar Vantage Series: Everything you ever wanted to know | DC Rainmaker
S410™/S210™
Polar RS100 Unisex Digital Heart Rate Monitor Black Silicone Band New Battery | eBay