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A Basal Body Thermometer

Tracking your basal body temperature can be the key that unlocks your fertility. If you can measure it accurately every day across your whole menstrual cycle (and potentially for longer) you can start to spot the patterns that reveal when you’re ovulating, and therefore when there is a viable egg in your body for sperm to fertilise.

To get an accurate answer you need an accurate, effective basal body temperature thermometer, so today we’re taking a look at the features they need, so you can make a good choice!

How Sensitive Does It Need to Be?

Your basal body temperature changes at the level of tenths of a degree, so you need a thermometer that is sensitive enough to clearly show these changes. Be wary about spending too much money for too much sensitivity though – you don’t need to know your temperature down to hundredths of a degree, and indeed that might cause you to get caught up in details and fail to find the pattern you need.

A thermometer that isn’t sensitive enough, that can only show changes of whole or half degrees simply can’t help you here: you won’t be able to see the changes in your temperature that you need.

What Sort of Display Does it Need?

To eliminate possibilities for error and ambiguity, you need to look for a thermometer with a digital read out. This will give you a very clear reading on your temperature that you can’t misinterpret. More retro thermometers, where the temperature as shown as a line that rises against a scale can be hard to read: you can get different numbers by looking at it from different angles. Eliminate ambiguity and pick the thermometer that will simply tell you what your temperature is.


This is more important than you may have suspected. There are different ways to take your temperature, and they’re not equally accurate. You’re likely familiar with having your temperature taken by putting the thermometer in your mouth or ear – these are relatively accurate and useful if you’re looking for temperature changes on the scale of whole degrees or more: fevers and chills.

You can get more accurate reads on your core temperature by takin your temperature rectally or vaginally. This is worth doing as it can help you find when you’re ovulating but you’ll need to choose your thermometer so it’s appropriate and comfortable for the purpose!