It is more of a medical device, which is primarily designed to measure the user's pressure.
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Xiaomi Watch H1 debuts as medical grade smartwatch that can take ECGs and measure blood pressure levels - News
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【Comprehensive Health Monitoring】 - Elevate your health insights to a new level with the advanced monitoring features of the SOUYIE smartwatch.
Smart Watch, Infrared True Blood Oxygen Monitor, 1.91 HD Smartwatch for Men with Heart Rate, Blood Pressure, Sleep Monitor, IP68 Waterproof Fitness
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Xiaomi HiPee 24 Hours Ambulatory Blood Pressure Monitor: full specifications, photo