Adopts optical principle and makes use of light penetrability. The palm of the finger is used as a test point, and a grip detector is used to emit a beam of light on one side, and the penetrating beam is received on the other side. The received signal is processed to obtain the value of glucose in the blood. <br />Lima's non-invasive infrared sensor measures blood glucose similarly to Russia. The former tests fingers and the latter measures earlobe. <br />New concept blood glucose meter. Not listed since 2011.