Accu-Chek Compact Plus Owner's Booklet page 29

8. The on the display gradually disappears and
the test result appears. The meter automatically
detects that you applied ACCU-CHEK Compact
Blue control solution. The bottle symbol appears
on the display when the measurement starts.
When the test result appears, the bottle symbol
is saved with the test result to identify it as a
control test.
Chapter 2: Control Testing
Example
9. If you used ACCU-CHEK Compact control
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solution, the bottle symbol is not displayed.
Press two times and the bottle symbol
appears. This must be done before you turn off
the meter in order to save the result as a
control test in the meter's memory.