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Amazon.com: POLAR Vantage V2 - Premium Multisport Smartwatch with GPS, Wrist-Based HR Measurement for All Sports - Music Control, Weather, Phone Notifications : Electronics
Polar Pacer Pro | Polar USA
Vo2 max: Garmin V Polar, which is likely to be more accurate : r/Polarfitness
Polar Pacer Pro with Running Test for VO2max | laboratory, treadmill | A running lab on your wrist. Normally, you would have to go to a laboratory, stick a mask