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Not your average thermometer, our basal thermometer works for Celsius and measures body temperature to two decimal places (i.e. 36.65°C). This specificity is needed for detecting the rise and fall in temperature that happen throughout the menstrual cycle. If you’re using the Natural Cycles app, the algorithm will use these subtle temperature changes to predict and confirm your ovulation. This BBT thermometer can also measure body temperature to detect fever or chills. Just like the Natural Cycles app, our basal thermometer is CE marked in Europe.