I bought the Qinux Vitalift smart watch (looks the same as the Libiyi version) and, having worn it for a number of weeks, can confirm it does not accurately measure Blood Glocose levels - usually shows between 4.5 and 7.5 mml/l regardless of finger prick readings between 3.5 and 14 mml/l. In other words absolute fiction. Also gives optimistic Blood Pressure readings e.g 117/77 when standard Blood Pressure monitor shows 152/92. Don't be drawn in!