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DS-991ES 4 Line FX-991ES Compatible - Dual Power Scientific Calculator with Natural Textbook Display
Key Features
  • True algebraic logic
  • Fractions
  • Trigonometrics and Inverse Trigonometrics
  • Hyperbolic and Inverse Hyperbolic
  • Sexagesimal Calculations
  • Factorials
  • Logarithmic and Exponential
  • Reciprocal
  • Coordinate Transformation
  • Absolute Value Calculation
  • ENG Conversion
  • Engineering notation
  • Complex numbers
  • Numerical integration / differentiation
  • Vector calculations
  • Matrix calculations
Which Calculator Is For You? (Scientific Series Comparison Chart)
Exam Acceptance
The DS-991ES scientific calculator is approved for use on:
SAT*, ACT*, and AP* exams.
SAT, ACT & AP are registered trademarks of the College Board, which was not involved in the production of and does not endorse this product. Policies subject to change.
Ideal For
  • General math
  • Pre-Algebra
  • Algebra 1 and 2
  • Geometry
  • Statistics
  • General science

4 Line FX-991ES Compatible - Dual Power Scientific Calculator with Natural Textbook Display  (DS-991ES)
Price: 26.00(MSRP)


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!

  • 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
  • Battery(s): 1 LR44
Dimensions:3.11x6.34x0.51 (inches) / 7.90x16.10x1.30 (cm)
UPC Case:1-07-67469-43992-1
Unit Packaging:6.8x9.5x1.15 (inches) / 12.50x23.00x2.40 (cm)
Carton Size: 20*13.4*10.3 (inches) / 51*34*26 (cm)
CBF/CBM:1.6 /0.045 
Carton Weight:25.3 lb / 11.5 kg
Carton Quantity:40

Flyer (.pdf) English
2015 Teledex Inc.