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My thermometer shows 'LO', what does that mean?

‘LO’ means low temperature, and not low battery – so no worries!

The reason why the thermometer shows ‘LO’ from time-to-time is because room temperature is roughly 21° C, which is too low for our basal thermometer (which can only measure down to 32°C) Remember to always place the thermometer under your tongue before you turn it on to avoid the thermometer showing LO.

Basal body temperature should be around 35.8–36.9 degrees. Any higher than this, then you probably have a fever and we therefore advise you to leave the reading for the day.


Order one basal thermometer from our web shop today!