Casio FX-991EX

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The Casio FX-991EX with 552 functions is a high-performance technical and scientific pocket calculator from Casio with an impressive high-resolution LC display. It has double the usual memory for performing a wide range of statistical calculations.

• Display: LCD with 192 x 63 pixels, 10 + 2 digits
• Natural display: The "natural display" lets you input and display fractions, square roots and other numerical expressions just as they appear in your textbook.
• Repetition / correction functions
• QR code function (result visualisation on your smartphone or tablet)
• Solving up to fourth order equations, inequations and simultaneous equations
• Numerical calculation of integrals and differentials
• Calculating minimum and maximum in quadratic functions
• 4x4 matrix and vector operations (incl. ref/rref)
• Tabular calculations
• Function calculations using the Calc key (temporary formula memory)
• Verify function: checks the equality of two expressions.
• Prime factorisation
• 9 memories for variables
• 40 unit conversions
• 47 scientific constants
• Calculating with technical units and symbols
• Calculations to base n (BIN/OCT/DEC/HEX)
• Angular calculations of and between DEG, RAD, GRAD
• Conversion of polar coordinates into right-angled coordinates and vice versa
• Calculating with complex numbers
• Comprehensive list-based statistics with 1 & 2 variables
• Distribution functions (normal distribution and inverse normal distribution, binomial distribution, Poisson distribution)
• Integer random numbers
• Logical operations
• Permutations and combinatorics
• Power supply: solar operation with backup battery