How Does a Basal Thermometer Work?
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Basal Versus Basic
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A basal thermometer works the same way a regular thermometer does, but it's more accurate. A basal thermometer takes longer to work as it is accurate to 0.1 degrees Fahrenheit; a regular thermometer is accurate to 0.2 degrees Fahrenheit.
Warmed Liquid
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Thermometers contain a liquid that expands when warm, such as mercury or alcohol. In the thin thermometer tube, the warmed liquid expands to a higher point on the tube, thus giving a higher temperature reading.
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Digital Thermometers
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As long as a digital thermometer is accurate to 0.1 degrees Fahrenheit it can be used as a basal thermometer. Digital thermometers marketed as basal thermometers often have memories or easy-to-read displays.
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