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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original content copyright, © 2011-2024. Edward Shore.
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