Polar OH1
This model helps you to easily keep track of your heart rate. It has a weight of only 17g, which makes it easy to wear.
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From Amazon
Polar OH1 + Waterproof Optical Heart Rate Sensor with Swimming Goggle Strap Clip and Armband - HR Monitor with Bluetooth, ANT +
£60.20
Watch Shop
Polar OH1 Optical Heart Rate Monitor
£69.50
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