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Sharp EL-W531 vs. Casio FX-991EX + 8
Colour/ material
White, Black, Silver, Blue
White, Black, Silver, Grey
White, Black, Grey, Blue
White, Black, Silver, Pink, Grey, Blue
Black, Silver, Grey, Blue
White, Black, Silver, Pink, Grey, Blue
Black, Silver, Grey
White, Black, Silver, Grey
Black, Blue, Yellow
White, Black
Dimensions (WxHxD)
Depth
161.5 mm
11.1 mm
89.5 mm
11 mm
21 mm
161 mm
13.8 mm
11.1 mm
15 mm
Height
15.5 mm
165.5 mm
5 mm
162 mm
184 mm
13.7 mm
162 mm
162 mm
8.6 mm
23 mm
Width
79.6 mm
77 mm
89 mm
80 mm
92 mm
80 mm
80 mm
80 mm
75 mm
86 mm
Product weight
100 g
90 g
230 g
90 g
230 g
110 g
100 g
95 g
660 g
210 g
Eco labels
BlueAngel
Features
Equation solver, Complex functions, Matrices, Statistical functions
Economic functions, Equation solver, Complex functions, Matrices, Statistical functions
Programmable, Colour screen, CAS (Computer Algebra System), Economic functions, Statistical functions
Equation solver, Complex functions, Statistical functions
Display light, Watch, Programmable, Calendar, Equation solver, Complex functions
Programmable, Statistical functions
Equation solver, Complex functions, Statistical functions
Programmable, CAS (Computer Algebra System), Economic functions, Equation solver, Complex functions, Matrices
Programmable, Colour screen, CAS (Computer Algebra System), Equation solver, Complex functions, Matrices, Statistical functions
Display characters/line
16
16
8
12
21
10
12
16
8
16
Display Lines
4
4
8
8
2
2
4
1
Type
Calculator
Calculator
Graphing calculator
Calculator
Graphing calculator
Graphing calculator
Calculator
Calculator
Calculator
Graphing calculator
Graphing feature
3D graphics
Parametric graphs, Polar graphs, Recursively defined sequences, Split screen
Parametric graphs, Polar graphs, Recursively defined sequences, 3D graphics, Differential Equations, Rectangular graphs
RAM (total)
61 kB
64 kB
RAM (usable)
65536 kB
ROM memory (usable)
100 MB
Battery operated
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Battery type
LR44
LR44
R3 (AAA)
LR44
R3 (AAA)
R3 (AAA)
R3 (AAA)
LR44
Li-Ion
External power connection
Solar cell
Solar cell
USB, Solar cell
Solar cell
External source (12-230V), USB
Solar cell
Solar cell
USB, Solar cell
Solar cell
External source (12-230V), USB