The device is said to be powered by two technologies, silicon photonics, and optical absorption spectroscopy.
The device is intended to measure the reflection of laser light directed into a region beneath the skin in order to determine glucose levels.
Apple is said to have tested the technology with hundreds of users.
Apple tested the technology under the guise of a startup, Avolonte Health.
In order to create new products and technologies that might one day be sold to the general public, Apple has a number of groups operating within its company.
The group was founded by late Apple engineering fellow Bill Arthas.
The goal of the group was to create novel battery designs and low-power processor technologies.