Can You Trust a Wristband Heart Rate Monitor's Accuracy?

If you care enough about your health and/or fitness to be thinking of buying a heart rate monitor, you may also care enough to want to know which you can trust to give a correct reading. There are, for example, perhaps a dozen different ways

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FITCENT Heart Rate Monitor Armband, Bluetooth ANT+ Optical Heart Rate Sensor Arm Band, Rechargeable Fitness Tracker for Peloton Strava Zwift Polar Beat DDP Yoga Wahoo Fitness (Black) : Sports

Which one is more accurate? I want to buy a smart band. It is important to me to have heart rate, stress and oxygen sensors. also I can read my messages and

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