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Casio FX-991EX Engineering/Scientific Calculator, Black, 3" x 6.5" x 0.4"
![Amazon.com: Customer reviews: Casio FX-991EX Engineering/Scientific Calculator, Black, 3" x 6.5" x 0.4"](https://m.media-amazon.com/images/W/IMAGERENDERING_521856-T1/images/I/81gPxzPx6-L._CR0,412,1060,1060_UX256.jpg "Amazon.com: Customer reviews: Casio FX-991EX Engineering/Scientific Calculator, Black, 3" x 6.5" x 0.4"")
Amazon.com: Customer reviews: Casio FX-991EX Engineering/Scientific Calculator, Black, 3" x 6.5" x 0.4"
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CASIO FX-991EX Classwiz Advanced Scientific Calculator - 552 Functions – In Deals We Trust
Found this incredible function on my Fx991EX if you press shift and Option button on left corner it creates a QR code that can be scanned with a phone to see graphing
