![background image](http://html.mh-extra.com/html/accu-chek/aviva-nano/aviva-nano_reference-manual_455907060.webp)
8. Press and release
to confirm the
control level in the meter.
9. “OK” and the control result alternate
on the display if the result is in range.
The range is printed on the test strip
container label. When the control result
is inside the range on the test strip
container, the test strips and meter
are working properly. “Err” and the
control result alternate on the display if
the result is not in range. Remove and
discard the used test strip.
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