Apple  (AAPL) - Get Report CEO Tim Cook has been spotted on the company's campus with a wearable device attatched to his Apple Watch that tracks his blood sugar level, sources told CNBC on Thursday. 

CNBC reported last month that a team at Apple is working on the "holy grail" for diabetes; a wearable device that tracks the body's blood sugar without being invasive.

"I've been wearing a continuous glucose monitor for a few weeks. I just took it off before coming on this trip," Cook told a group of students at the University of Glasgow in February. 

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