Product Description
Reliable Power When Every Calculation Matters
A scientific calculator may have hundreds of functions, but those functions are only useful when the calculator is ready to work.
The SENBO Solar Scientific Calculator stands out with its practical dual-power design, combining solar-assisted operation with a replaceable button battery. In suitable lighting, the solar panel helps support everyday use, while the battery keeps the calculator working when available light is limited.
Whether you are completing homework, revising for an important test or working through a long technical calculation, this two-way power system provides extra reassurance when you need dependable performance most.
Why Dual Power Makes a Real Difference
Solar-Assisted Operation
The built-in solar panel helps power the calculator in suitable lighting, reducing complete dependence on the internal battery during regular use.
Replaceable Battery Backup
When lighting is limited, the replaceable button battery continues supplying power, making the calculator practical for classrooms, libraries, offices and evening study.
Automatic Power-Off
When left inactive, the calculator switches off automatically to help reduce unnecessary battery consumption.
Reliable for Daily Carry
You do not need to connect a charging cable or search for a wall socket before studying. Simply take it from your bag and begin calculating.
The dual-power system is especially useful for students who carry their calculator between school, university, tutoring sessions and home.
More Than Reliable Power
Alongside its practical power system, the calculator provides 417 scientific functions and 8 calculation modes for a wide range of mathematical tasks.
Supported functions include:
Fractions, powers, roots and logarithms
Trigonometric calculations
Statistics and equations
Integration and differentiation
Complex numbers
Matrices and vectors
Function tables
Number-base calculations
From everyday mathematics to more advanced study, one compact calculator can support different subjects without needing multiple devices.
Natural Display for Clearer Formula Reading
The natural textbook-style LCD display presents supported fractions, roots and mathematical expressions in a format that looks closer to printed textbooks and handwritten notes.
This familiar layout makes it easier to check formulas, follow longer expressions and compare calculations with study material.
Four-line display support also helps organise multiple values, lists, matrices and function-table information more clearly, depending on the selected mode.
Review Mistakes Without Starting Again
A single incorrect number should not mean entering the entire formula again.
The Multi-Replay navigation control allows you to move through previous input, return to the section that needs attention and make a correction before continuing.
This saves time during homework, revision and long calculations while helping the entire process feel less frustrating.
Ready for School, University and Office Use
The calculator features clearly labelled, responsive plastic keys with colour-coded secondary functions, helping different operations remain easy to identify.
Its slim body fits comfortably inside a school bag, university backpack or laptop case. The included sliding protective cover helps shield the screen and keypad from everyday scratches while being transported or stored.
Suitable for:
School and university mathematics
Science and engineering-related study
Statistics and technical calculations
Homework and revision
Home and office numerical work
Important: Calculator rules differ between schools, universities and examination bodies. Check the applicable requirements before using it in a formal examination.
Specifications
Brand: SENBO
Product Type: Solar Scientific Calculator
Model Style: FX-991ES Plus
Functions: 417
Calculation Modes: 8
Display: Natural Textbook-Style LCD
Display Capability: Four-Line Support
Replay: Multi-Replay
Power: Solar-Assisted + Replaceable Button Battery
Power Saving: Automatic Power-Off
Approximate Size: 162 × 80mm
Approximate Weight: 113g
Colour: White with Blue and Orange Key Details
Cover: Sliding Protective Cover
What's in the box
1 x SENBO Scientific Calculator
1 x Sliding Protective Cover
