Casio FX-991ESPLUS Scientific Calculator Black FX-991EX-S-UT The FX-991EX-S-UT advanced scientific calculator features a new high-resolution LC display with 192 x 63 pixels and a resolution that is four times higher than that of the FX-ES plus series. This calculator has over 550 functions, and has 47 scientific constants. Thanks to the QR code function, calculation results can be viewed on a smartphone or tablet, increasing your flexibility when working on the move.