The CORE body temperature sensor 

The adaptation score will no longer be unit bound, but account specific. With the CORE 2, you can change the CORE sensor and it will not influence your accumulated adaptation score.

Note that using 2 CORE sensors at the same time will cause the adaptation to count for both units.

CORE uses a thermal energy transfer sensor from greenTEG in combination with a sophisticated AI algorithm to calculate the Core Body Temperature.

The AI algorithm calculates the Core Body Temperature with the highest accuracy in comparison to other technologies.

With the Calera technology the CORE sensor has a high level accuracy in different environments (e.g. under the sun, during intense physical activity, and within a large range of ambient temperatures and humidity)

The CORE sensor is waterproof and can be used while swimming.

After active sports and swimming we recommend rinsing CORE with clean water and soap. The medical-grade plastic case can also be disinfected using 70%-75% alcohol.

Do not use acetone or 100% alcohol as these solvents will destroy the plastic material.

The specially design magnetic power cable means that the CORE device remains closed/sealed.

For everyday use - the CORE sensor saves data internally and broadcasts to paired devices that are within range. This means that a phone and the CORE App is not necessary for this type of use.

The role of the CORE App
For regular use, the CORE App is useful as it synchronize the data from your CORE sensor (independently to paired devices). where it is permanently stored and available. The advantage is that the CORE App can provide advanced insights and analysis.

To set-up the CORE sensor, update the firmware and adjust settings, the CORE app is required. The CORE App allows the CORE sensor to be owned (and for sharing to be managed).

For complete control of the CORE sensor and to benefit from the latest updates and improvements - it is recommended to have the CORE App installed and setup. Read more setting up the CORE App.

When you are wearing the CORE sensor, it will continue to record.

The CORE sensor has an internal memory which stores data, even when disconnected from the CORE App for Android or iOS. The next time you start your app and connect, the App will synchronise and load the metrics.

If you are using the CORE sensor with a paired devices cycle computer or watch, the CORE must remain within range to record the core body temperature metrics to the FIT file. In the rare case that the signal to the CORE sensor is temporarily lost, the device will not display the real-time values and the FIT file will have missing data.

Chest straps are commonly used for heart rate monitors and the CORE sensor. However, some women find these chest straps uncomfortable or even painful. There are some alternatives to use of CORE without a chest strap:

Attach the CORE sensor to the bra band or sports bra on the side or the back of the body. The black plastic clip that helps secure the sensor may or may not be needed, depending on the width and the material of the bra band or sports bra.

You can also use the adhesive patches to stick the CORE sensor to the torso. Replacement patches can be purchased from our store. The patches with the blue liner are suited for everyday use while the patches with the white liner are suitable for sports use.

It is also possible to wear the CORE sensor on your arm using an arm strap. Please note that accuracy can be lower than when CORE is positioned on the torso.

Keep in mind, for sports usage, CORE needs data from a heart rate monitor for its algorithm to deliver the most accurate core body temperature.

Data download is exclusive to our flagship product, CALERA research. CORE is intended for athletes who want to monitor their performance via their live data and graphs.
CALERA research
- allows to easily manage multiple devices logged into one account,
- download 1 second resolution data from the pc tool,
- is individually calibrated for extra reliability and accuracy,
- and comes with extra research support.