Zeal fertility thermometer, 2000.
3 4 c m
actual image size: 32cm x 26cm

Zeal fertility thermometer, 2000.

© Science Museum / Science & Society Picture Library


This thermometer is used to take a woman's temperature every morning as soon as she wakes up, and is sensitive enough to measure very small changes in temperature. Around the time of ovulation, a woman's temperature will change slightly, and by recording her daily temperature she will be aware when she has ovulated and is therefore fertile.

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