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When you open the app for the first time, you have to go through a number of steps.
You must do the following:
On the home screen of the app you will see an image that explains how to apply the sensor. If you press the small blue question mark icon you will receive more information about installing the sensor.
If this is successful, click 'next'.
You connect the sensor to the app by holding your phone on the sensor.
The app can only scan the sensor if NFC is activated in your mobile. Most phones have NFC turned on by default.
If this is not the case for you, you can turn on NFC by going to your phone's settings.