a significant temperature rise if the temperature rise is of low significance then in step 566 it displays u201c possibly fertile u201d yellow signal if the temperature rise is of high significance then in step 566 it displays u201c infertile u201d green signal if in step 556 the chip 103 determines that the temperature rise is not significant then in step 560 the chip 103 stores and evaluates the result in step 560 based on the day of the cycle and the temperature readings the chip 103 determines whether ovulation has already taken place in this cycle and generates a display of fertility state the chip 103 displays the result on the thermometer 101 and also makes the display available via the application software 202 on the personal computer 301 or on the smart phone 302 the actions in step 560 also occur after each of steps 561 562 563 and 566 the chip 103 uses several measures to get a failsafe handling of temperature recordings first in step 523 temperature measurement is not finished until the value has stabilized if the temperature decreases significantly during the measurement the value is not accepted until the temperature rises again to an acceptable value this is because normally the basal body temperature will not significantly fall during the short period of measurement falling values thus are due to improper handling of the sensor 113 breathing cold air or similar influences which impede getting valid data another measure used to get a failsafe handling of temperature recordings is that temperature values are evaluated with statistical methods and require a high significance for an accepted temperature rise a third measure used to get a failsafe handling of temperature recordings is that the required level of significance is.