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Casio Scientific Calculator

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Type Scientific
Brand Name Casio
Model No FX991ES Plus
Key Type Plastic
Power Source Solar Powered with an Auxiliary Battery
Weight 95 g
Length 162 mm
Height 11.1 mm
Width 80 mm
  • Natural V.P.A.M. Display
  • Dot Matrix Display
  • 15 and 10+2 Digits Display
  • Numerical Integral and Differential Calculus
  • Random Integers
  • New Equation Mode
  • Improved Equation Mode
  • Random Integers
  • STO/RCL Keys and Scientific FunctionsView More


Casio was established in April 1946 by Tadao Kashio, an engineer specializing in fabrication technology. Kashio's first major product was the yubiwa pipe, a finger ring that would hold a cigarette, allowing the wearer to smoke the cigarette down to its nub while also leaving the wearer's hands free.

Today, Casio is best known for its wide range of digital cameras, its durable and fashionable watches and its array of electronic keyboards.

However, other loved Casio products include calculators, cash registers, illuminators, laptop and sub-notebook computers, mobile phones, PDAs, electronic dictionaries, Digital Diaries, computer printers, clocks, and portable televisions.