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Polar - Introducing Polar OH1 optical heart rate sensor. Optimized for use on the lower or upper arm, Polar OH1 provides an alternative method for measuring your heart rate during training. In
Polar OH1 или Polar H10 - как выбрать датчик пульса?
Нагрудный пульсометр Polar H10 или оптический датчик Polar OH1. Что лучше?
Which Polar Sensor is Best for Me? | Wiggle Blog
Polar Verity Sense Scientific Review (versus OH1+, H10) - YouTube