Femometer is a fertility thermometer designed for women. It measures the body basal temperature which is displayed on the mobile phone. According to the changes in the body basal temperature, the application on the phone accurately predicts the next cycle information, such as ovulation, menstruation, unfertile phase and so on. There is no screen or buttons on Femometer. It transfers the data automatically through Bluetooth, so it does not require users to do redundant operations. The part under the tongue is ergonomically designed, you will feel so comfortable when you have Femometer in your mouth. The measurement error will be plus or minus 0.05 degree Celsius.