MABIS BASAL THERMOMETER BENEFITS: Detects possible ovulation by testing basal body temperature. FDA approved. Battery included. Clinical accuracy. Fast results quick 60-second readouts to a 100th of a degree. MABIS DIGITAL BBT THERMOMETER FEATURES:Easy-to-read Fahrenheit LCD display Basal Body Temperature recalls your last reading making it easier to detect any temperature changes from day to day Comes with a 12-month supply of ovulation charts making it easier to track your cycles Includes clear storage case and replaceable LR41 long-life battery. Sounds a helpful tone when it registers the peak temperature Works orally