Thing is, you can be in ketosis and not lose a thing.

And you can get a blank reading on the stix because your body already burned the ketones for fuel (and you think you're not in ketosis).

Etc.

Therefore I do regard them as a total waste of money. Not only that, they are an immense source of frustration for people who turtle or have stalled.

I tried them too, during first weeks of induction, got mauve to purple readings and felt like a good Atkineer. But when that first package was used up, I didn't see the point in buying a new one just for the fun of weeing on my hand every day.

Losing weight and having dragon breath was enough evidence of ketosis for me.