Ketones in the urine
Organa Keto The levels of ketones in the urine can be measured more traditionally, with urine test strips (sold over the counter in pharmacies or on Amazon ). These test strips give less reliable results for several reasons, and the above recommendations can not be applied directly. However, they are much cheaper.
My personal experience
You can read what I wrote about a two-month personal experiment: Experiment: optimal ketosis to lose weight and increase physical performance . Four weeks of a strict ketogenic diet with ketone control Final report: two months of a strict ketogenic diet with control of ketones.