The Clearblue Digital Ovulation Test Is An Easy-To-Use Home Ovulation Test That Is Over 99% Accurate At Detecting The Fertility Luteinising Hormone (Lh) Surge. The Optical Reader Interprets Your Result And Gives You A Clear Smiley Face In The Result Window When Your Lh Surge Has Been Detected, Identifying Your 2 Best Days To Try For A Baby