‘LO’ means low temperature, and not low battery – so no worries!
The reason why the thermometer shows ‘LO’ from time-to-time is that it is reading the room temperature - which is roughly 69.8°F/21°C. This is too low for our basal thermometer which can only measure down to 89.6°F/32°C.
If the thermometer shows 'LO' after you've measured, this could mean that you need to adjust the way you measure. Please make sure to place the thermometer as far back as possible in your mouth and underneath your tongue, right at the root of your tongue, then close your mouth tightly before you turn it on to avoid the thermometer showing LO.
Basal body temperature is usually around 96.3-98.4°F/35.8–36.9°C degrees.
You can order a thermometer in our webshop using the following links according to your country or region: