CoaguChek XS System User Manual for Self-Testing, version 10.0 USA
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Code Chip
Each box of test strips comes with its own code chip.
The code chip provides the meter with information
such as the lot number and expiration date of the
test strips.
Before each test, make sure the correct code chip is
in the meter. Each time you open a new box of test
strips, replace the old code chip with the new one.
Caution: Using the wrong code chip can produce
incorrect results.
Protect the code chip from moisture and also from
equipment that produces magnetic fields, such as a
microwave oven.