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I think these are very common in Sweden? Pretty much every type I diabetic I've met here have a sensor and insulin pump.

Is this a different type of sensor?

CGMs and pumps are already common; what's new here is continuous ketone monitoring alongside glucose

This has been done by the open-source community for a decade+ already. https://github.com/LoopKit/Loop

This has nothing to do with continuous ketone measurements

ketone monitoring is pretty unusual