MABIS Digital Basal Body Thermometer for Ovulation Tracking, Fertility, Period Tracking and Natural Family Planning with Beeper and Memory, Oral Use Only - EASILY DETECT AND TRACK OVULATION by conveniently testing basal body temperature. Your basal thermometer conveniently recalls your last reading so you can detect changes in temperature from day to day - EASY TO READ LCD DISPLAY BASAL THERMOMETER informs you with a helpful tone when it registers the peak temperature and has a large, easy to read instant display - CLINICALLY ACCURATE DIGITAL BBT THERMOMETER is tested for clinical accuracy and made in an and ISO registered facility - BBT OVULATION THERMOMETER includes: clear plastic storage case probe covers, replaceable LR41 long-life battery, and a 12-month supply of ovulation charts - EASY TO USE: Place the thermometer in the mouth, under the tongue with mouth closed for approximately 1 minute. When the temperature stabilizes, 4 beep tones will sound indicating monitoring is complete - - - 0.5 x 4.5 x 0.25 inches; 0.8 Ounces