Casio fx-991ZA PLUS II User Manual page 93

1. Press .
2. Press .
• This displays the information below.
- Calculator ID number (24-character string)
- QR Code for accessing the Worldwide Education Service
(https://wes.casio.com/calc/)
3. Access the above site.
4. Follow the instructions on the display to verify the authenticity of your
calculator.
Press to return to the mode menu.
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