Source: Martina. "Measuring Ketones." Web blog post. KetoDietApp.com. Compumaster Ltd., 30 Nov. 2013. Web. 14 Apr. 2016. <http://ketodietapp.com/Blog/post/2013/11/30/Ketosis-Measuring-Ketones>.
There is a growing obsession when it comes to measuring ketones precisely. Although urine detection strips may not be accurate for keto-adapted people, they work for most of those that have just started the ketogenic diet. By the time they become keto-adapted, which takes 3-4 weeks, most of them understand what to eat and what to avoid without any real need to measure the precise level of ketone bodies.
When starting out, you can use Ketostix to find out when you are in ketosis and what your net carbs limit should be. Daily net carbs intake should vary from 30 to 60 grams depending on how active you are.
Give Ketostix a try. If you really need to keep track of your ketone levels, use a blood ketone meter or the breathalyser. In the end, what really matters is not ketones but the effects of low-carb diets: weight loss and improved health.