Welcare Digital Thermometer OvulatingWhen planning for a family, it can be very useful to track your fertility cycle and know when your most fertile days are to achieve the highest success rate of becoming pregnant. An easy way to do this is by using an Ovulation Thermometer. Unlike a regular thermometer, an Ovulation Thermometer can accurately take your basal body temperature (BBT) to 2 decimal places ensuring every change in temperature is tracked and recorded.