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. To ensure that your thermometer is a basal body temperature thermometer, 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 or online.
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