These test sticks are compatible with both the old style Clearblue Fertility Monitor and the New Advanced Clearblue Monitor. The 60 sticks will give you 6 cycles of use. Clearblue Fertility Monitor is the most advanced home method to maximise your chances of conceiving. In recent research use of the Clearblue Fertility Monitor was shown to increase the chances of conceiving by 89% over the first two cycles of use. Most home ovulation tests identify the 2 peak fertility days during a woman's cycle by detecting the surge in luteinising hormone (LH) that triggers ovulation. The Clearblue Fertility Monitor not only shows these 2 peak fertility days, but ALSO identifies additional 'high fertility days' when you can conceive.