There's an article in the New York Times today that covers diabetes management technology and the large recurring costs of diabetes supplies

http://nyti.ms/PxdJNO

As others have said, non invasive monitoring is the holy grail and huge amounts of money are looking for a non invasive solution. But innovation here is likely to come from a start up that doesn't have the existing recurrent revenue model to be disrupted

But it's really hard. I think the chances of this particular one being a scam are pretty high