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What Is the Evolution of Hr V?
The technology that we used, for example, to measure with the phone camera, just to capture changes in blood volume. So these technologiess were developed, actually, in the first prototypes in the 19 thirties - so that's been a long time. And i think this as also that to better research, or at least morerealistic settings in the past few years which also helps understanding the limitations of h r v.