Help with breath meter

[Ray_Podesta]

I have been following a strict Keto diet and have been losing at least 2 lbs per week yet when I blow into my new meter and get all zeros. This is my second meter. Assuming since I’ve been losing weight each week and following a strict Keto diet I’m in Ketosis I should be getting a number and not a zero like I’m getting. Does anyone know why?

[KetoCancerMom]

What meter is it?
When are you testing? (Time of day, in relation to a meal, etc)?