If you follow a ketogenic diet, there will be a time when your body starts producing ketones. It is important that you measure this because it is dangerous if your ketosis is too high. When it is too high you can get into starvation ketosis and you definitely don’t want that. In addition, a high ketone value is also dangerous if you have type 1 diabetes.
With a ketogenic diet, your fats burn and ketones are released. Ketones are acids that make the blood acidic. There is then a keto acidosis.
You can measure this with different devices. I do this with the GK-Dual meter. This meter is ideal, because you also measure glucose values immediately.