Spotlight: NEWYES GY991 MS
This is going to be a quick spotlight on the NEWYES GY-991 MS, a clone of the Casio fx-991 MS made in China.
Features
Model: GY-991 MS
Company: NewYes
Modeled after: Casio fx-991 MS
Number of Functions: 401
Display: Two Lines
Battery: Solar, with backup battery L1154F (equivalent LR44)
Price: circa $11 - $12
The GY-991 MS is a two line scientific calculator with many functions including:
* numerical integration
* numerical derivative
* complex arithmetic (R<>I indicator, with ⅈ and ∠ to indicate imaginary and angle parts)
* 40 scientific calculators (circa 2008 values)
* 40 U.S./International unit conversions
* Polar to Rectangular conversion (x stored in E, y stored in F)
* Rectangular to Polar conversion (r stored in E, θ stored in F)
The display has two lines: the top is the calculation while the bottom line is the result. The calculator is algebraic, so you can type expressions as they are written.
The GY-991MS is similar to the Casio fx-991 MS in functionality.
Modes (by repeated presses of the [ MODE ] key):
COMP: Regular
CMPLX: Complex Mode
SD: One-variable statistics
REG: Two-variable statistics
BASE: base conversions and Boolean logic. The four bases available are decimal, binary, octal, and hexadecimal. The Boolean logic functions (and, or, xor, xnor, not, neg, with suffixes) are accessed through the repeated presses of the [ x^-1 ] button.
EQN:
Unknowns: 2 or 3: Simultaneous linear equations of 2 or 3 variables
Degree: 2 or 3: Quadratic or cubic polynomial solver
MAT: Matrix mode, 3 matrices (A, B, C) up to 3 x 3. Operations available: Det (determinant), Trn (transpose), Inverse through the [ x^-1 ]
VCT: Vector mode, 3 vectors (A, B, C), 2D or 3D. Operations available: dot product (through the VCT menu), cross product ([ × ] key), norm ([SHIFT] [ ) ] (Abs))
Angle modes: Deg, Rad, Gra (degrees, radians, gradients)
Display modes: Fix, Sci, Norm
Disp mode: Engineering mode on and off, fraction display, dot/comma decimal separator
Six regression models are available: linear, logarithmic, exponential, power, inverse, quadratic
The keys are plastic, but feel serviceable and responsive. The calculations are comparable. If you are not planning to take classes or take a high-stakes certification exam, it may be an off-brand model to try. It is also a good, inexpensive calculator to use.
Eddie
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