In my opinion, the best test of the CB series! I have in my first Ss the CB & Monitor uses the Ss tests with success. See picture, this was at ovulation +13 days and clear, it does not get any. If the results of this test indicates how far the Ss has progressed, for example, 1-2, 2-3 (like on my photo) or 3+. I would buy it again at any time - in online pharmacies but there is already the 2er package füt almost 10! Good Luck!