Roche Accu-Chek Performa Manuel De L'utilisateur page 90

(example)
8. Press and release
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
88
container label. "Err" and the control
to set the control
(example)
result alternate on the display if the
result is not in range. Remove and
discard the used test strip.