Fertile-Focus is a personal ovulation microscope that allows you to predict ovulation with 98% accuracy! When a women is about to ovulate, a distinct crystal or "ferning" pattern becomes present in her saliva due to hormonal changes. To find out if you are about to ovulate, simply place a drop of saliva on the lens and read the pattern. With its sharp, lab-quality focusable lens, Fertile-Focus allows you to confidently pinpoint when you are most likely to conceive!