The clearblue digital ovulation test is the most effective home ovulation test kit3 it gives you clear digital results so theres no need to interpret the lines and gives you more test sticks than any other brand making it more effective at detecting your lh surge you use the clearblue digital ovulation test once a day at the same time each day on the days around the time when you expect your lh surge it identifies the days in your cycle when you are most likely to conceive