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11. Keypad lock
This function locks the keypad except for the on / off button and access to
the options menu.
When a key is pressed with the keypad lock activated, no action is performed
and the display shows LOCk for 1 second. That is, while the keypad is locked
it is not possible to set a tare, reset to zero, print a ticket or reset total
accumulated weight.
This option stays in the memory and is not deactivated when the device is
switched off and on.