As far as I'm aware there isn't currently a device to detect levels from breath.
I had assumed (so probably not worth very much) that diabetic alert dogs could detect hypos/hypers based on changes in your whole smell, not just from your breath. I have heard that your breath can smell like acetone when high, but I think you have to get very high for that to be noticeable. I can have on a few occasions when hypo, & having hypo sweats, noticed a funny twang to my sweat (delightful!) & that's why I had assumed the dog was alerting to your general scent rather than just your breath.