4 Line FX-991ES Compatible - Dual Power Scientific Calculator with Natural Textbook Display

Regular price $30.00 Sale


This scientific calculator with 4-line alphanumeric natural textbook expression display has over 400 functions to help tackle even the most difficult math or science challenges. The natural textbook displays shows formulas and results as they appear in textbooks, eliminating any ambiguity and doubt while tackling complicated calculations. The calculator, with hard protective case, runs on solar power with battery backup, saving energy and money with minimal battery usage.

Datexx’s scientific calculator series provides the heavy-duty functionalities needed while incorporating added benefits and features to make the calculators user-friendly. Not only do Datexx’s scientific calculators offer the same or even more features than comparable offerings on the market, but also have better price points and usability. It’s a no brainer choice all around for students and professionals!

Key Features

  • Great for general math, pre-algebra, algebra 1/2, general science, statistics, geometry, pre-calculus, and physics
  • Natural textbook display shows formulas and results as they appear in textbooks
  • Easy-to-read, 4-line alphanumeric 10+2 digit display
  • 410 Functions
  • True algebraic logic
  • Adjustable display contrast
  • 15 digit internal calculations
  • 9 Memories
  • Multi-statements
  • Last answer memory
  • Dot matrix display
  • Parentheses
  • Replay and correct
  • Fractions
  • Trigonometrics
  • Inverse trigonometrics
  • Hyperbolic
  • Inverse hyperbolic
  • Sexadecimal calculations
  • Sexagecimal / Decimal conversions
  • Factorials
  • Permutations and combinations
  • Base-n calculations
  • Logical operations
  • Logarithmic and exponential
  • Square root
  • Roots and powers
  • Reciprocal
  • Coordinate transformation
  • Absolute value calculations
  • ENG conversion
  • Engineering notation
  • Complex numbers
  • Numerical integration
  • Numerical differentiation
  • Table function
  • Vector calculations
  • Matrix calculations
  • Solver function
  • 20 Pair metric conversion
  • 40 Scientific constants
  • Sum calculations
  • Equation solving - Quadratic, Cubic, Simultaneous with 2-3 unknowns
  • Statistical calculations - Mean, Variance, Standard Deviation, Probability Distribution, Regression, Linear, Logarithmic, Exponential, Power, Inverse, Quadratic
  • Hard Protective Case
  • Solar Powered with Battery Backup


  • Dimensions: 3.11x6.34x0.51(inches) / 7.90x16.10x1.30 (cm)
  • Battery: 1 x LR1130


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