Roche CoaguChek XS Manuel D'utilisation page 23

Every time you insert a test strip in the meter, the display shows the
number of the code chip that is presently inserted. Always compare the
code number you see on the display with the number that is printed on
the test strip container. If the two numbers are identical, confirm by
pressing the M button (see page 49).
If the code numbers are not identical, turn the meter off and insert the
correct code chip. Discard the old code chip to prevent mix-ups.
If the code chip is missing or incorrectly inserted, Error and Code appear
in the display (please refer also to the chapter Error Messages starting
on page 77).
3 Slide the new code chip into
the slot on the side of the
meter as shown until you feel
it snap into place.
Code Chip
23