Акку-Чек Перформа Нано - Manual (Page 64)

Maintenance and Troubleshooting
The meter needs little or no maintenance with normal use. It automatically tests its
own systems every time you turn it on and lets you know if something is wrong.
If you drop the meter or think it is not giving accurate results, call Roche.
To make sure the display is working properly, turn the meter off, then press and hold
to see the complete display. All the segments should be clear and look exactly like
the picture below. If not, call Roche.
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