It can mean one of a couple of things:
~An error occurred, when this happens you should turn it off, reset the unit, and turn it back on after at least 20 seconds have passed. You can also remove the battery and put it back in if you don't want to reset the meter
~You need to run a control test with control solution to realign the machine
~You inserted a used test strip or faulty test strip into the meter, try another strip
have inserted a test strip that has already
been used or is too old. Clean the
measurement optics (Chapter 7.1) and
repeat the test with a new Accu-Chek
Active Glucose test strip."
17.January.2015
17.January.2015111
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