This error means the test strip has already been used or is not valid for testing.
What to do:
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Remove the strip and discard it.
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Use a new, unused test strip from a valid vial.
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Make sure the test strip is not expired.
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Insert the strip only when you're ready to test, and apply blood after the blood drop icon flashes on the meter screen.
Your meter is now ready to perform a valid blood sugar test.