Accu-Chek Advantage User Manual page 53

If result has not been marked with an L1 or L2,
refer to the test strip container label for the
glucose control ranges.
and
Example of an acceptable Level 1 control result.
If result is not within the acceptable range, a control
bottle symbol appears on the screen while the control
test result, and time and date (if set), alternate
with "Err" and "L1" or "L2" on the display. See
"Understanding Control Results" for more information.
and
Example of an unacceptable Level 1 control result.
9. Remove the used test strip from meter and discard.
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