The Apple Watch could someday replace the glucometer which requires diabetics to prick their fingers multiple times each day
Apple’s work on non-invasive blood glucose monitoring is considered a project for the semiconductor team as opposed to the health team because it requires the creation and use of cutting-edge sensors and chips. The technology involves focusing a laser under the skin to measure how much glucose is in the user’s blood. The project is still in the proof-of-concept stage and needs to be sharply reduced in size in order to be deployed inside the Apple Watch. The hardware, at this stage, is the size of an iPhone which is obviously too large.
Source: Phone Arena