Difference between Scientific Calculator Version E, F, A, and B
The Casio calculator version F or E are original whiles versions A & B is fake. As a general rule of thumb,
- Press SHIFT + ON + 7 at the same time to open the diagnostic screen.
- If you’re on Casio Fx-99IEs or FX-991ES Plus, press 9 to continue
- Keep pressing the SHIFT key until you arrive at a screen where it shows some details regarding your calculator version.
- If the version is VerA or VerB, then your calculator is using an alpha reject and it’s fake.
- If your version is VerE or VerF, then your calculator is a genuine product.
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