Accu-Chek Aviva Combo - Manual (Page 169)

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5
5.8 Turning Key Lock On or Off
The­key­lock­feature­allows­you­to­lock­all­of­the­buttons­on­the­meter,­except­for­the­power­on/off­button.­
This­serves­as­a­safety­measure­against­unintentional­activation­of­meter­functions.
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