Clearblue Advanced Fertility Monitor Pregnancy Test pack contains 6 pregnancy tests, individually wrapped, to be used only with the Clearblue Advanced Fertility Monitor (sold separately). These are simple urine tests that detect hCG in your urine from up to 3 days before your period is due to tell you whether you are pregnant or not. The tests are read by the Monitor and after 5 minutes will give you a clear 'Pregnant' or 'Not pregnant' result on the screen. The result will also be stored inside the Monitor and displayed on your personal fertility calendar. The results are over 99% accurate from the day your period is due.