Advance for delivery: The delivery took a long time, but so was announced in the order confirmation. To The Product Ordered to check the ketosis my Ketostix. The leaflet is simply written and the strips are easy to use. On the box is also explained once how to apply the strip exactly. The only drawback is that the result is influenced by the absorption of vitamin preparations. Since the test strip is very small, I will not use the evidence of the other reviews and do not cut the strips in half. 50 strips for the price is so very reasonable.