instructions_to_use_a_card_reader_with_the_biozoom_app.pdf
If you want to use the NFC reader as well as have some user inputs (such as weight, age, or height), you might need to enable the virtual keyboard while a physical keyboard is attached.
This is due to the NFC reader being recognized by the android system as an external keyboard, and the tablet/phone would, by default, not show the on-screen keyboard while the NFC reader is attached.
To enable this, search within the system settings for something like "Physical keyboard".
In our case, this was under:
Settings -> System -> Languages&input -> PhysicalKeyboard -> Show virtual keyboard
Then check this box.