A fertility monitor is a device that helps individuals track their reproductive health and identify their most fertile days. It typically measures hormone levels in urine or saliva, providing insights into ovulation cycles. This information can be useful for those trying to conceive or for those practicing natural family planning. Many fertility monitors come with user-friendly features, such as digital displays and smartphone connectivity. They can store data over time, allowing users to recognize patterns in their cycles. Some popular brands include Clearblue and OvaCue, which offer various models tailored to different needs and preferences.