Easy to Use: Auto memory shows last temperature taken. Fast, one-minute temperature read-out. Battery/storage case included. Automatic shut-off. Easy to Read: Extra large lighted display for easy reading. BASAL BODY TEMPERATURE: Basal temperature is the normal body temperature of a healthy person immediately upon awakening in the morning. This temperature normally rises after ovulation due to hormonal changes. Thus, a temperature increase near the middle of your menstrual cycle can indicate ovulation has occurred. IDENTIFYING OVULATION TIMING: Tracking your basal temperature can help you to identify ovulation timing.