Choosing a thermometer
What kind of thermometer should I use?
It is important that you use a Basal Body Temperature (BBT) thermometer for accurate fertility charting. If your chart is unclear or unusual, you don't want to wonder whether or not your thermometer is responsible for the ambiguity or unusual pattern. A fever thermometer, even a digital one, is not usually able to give you the sensitivity and precision you need for fertility charting. You need to make sure that your thermometer is a BBT one. It should say BBT, Basal Thermometer, or Fertility Thermometer on the package.You can find a BBT thermometer at most well-stocked pharmacies and drugstores. We recommend using a digital BBT thermometer for ease of use, but a mercury BBT thermometer will also work.