The second time I used the device it failed to sync with my mobile and complained bitterly about the lack of Bluetooth connectivity. Uninstalled app, then reinstalled, and in doing so realized that Location had to also be activated.
Subsequently learned to breathe steadily into the sensor while fully emptying my lungs and the results are amazingly consistent. Any significant changes to diet are reflected in the readings, thereby providing diagnostic data for detecting good and bad dietary choices.
An excellent tool which I am glad I purchased.
Pros and Cons:
Bottom Line: Yes, I would recommend this to a friend
