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Calibre is a technological marvel that measures & analyzes your breath in real time, bringing to you unprecedented insights about your metabolism and health.
Use Calibre for a month, and if you don't like it, we will take it back, no questions asked!
If you are in the US, free shipping is always an option!
We're confident in our product. If anything happens or something isn't up to par, let us know and we'll make it right!