---
product_id: 709326133
title: "Scientific Calculator 552 Functions 2-Line 10+2 Digits Written Display Solar Battery - Ideal for Middle High School Students and Teachers, Black (OA-991EX Plus)"
brand: "dupota"
price: "€ 117.04"
currency: EUR
in_stock: true
url: https://www.desertcart.es/products/709326133-scientific-calculator-552-functions-2-line-10-2-digits-written
store_origin: ES
region: Spain
---

# 2-line high-res display 552 advanced functions dual solar & battery power Scientific Calculator 552 Functions 2-Line 10+2 Digits Written Display Solar Battery - Ideal for Middle High School Students and Teachers, Black (OA-991EX Plus)

**Brand:** dupota
**Price:** € 117.04
**Availability:** ✅ In Stock

## Summary

> 📐 Elevate your math game with precision and power — never miss a calculation!

## Quick Answers

- **What is this?** Scientific Calculator 552 Functions 2-Line 10+2 Digits Written Display Solar Battery - Ideal for Middle High School Students and Teachers, Black (OA-991EX Plus) by dupota
- **How much does it cost?** € 117.04 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.es](https://www.desertcart.es/products/709326133-scientific-calculator-552-functions-2-line-10-2-digits-written)

## Best For

- dupota enthusiasts

## Why This Product

- Trusted dupota brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Power Through Exams:** Dual solar and button battery system ensures uninterrupted performance when it matters most.
- • **Lightweight & Durable:** Sleek 125g design with pressure-resistant cover fits perfectly in your backpack or briefcase.
- • **Speed Meets Precision:** Quad-core processor accelerates matrix and vector operations, saving you valuable time.
- • **See Every Step Clearly:** High-resolution 2-line display shows formulas and results simultaneously for intuitive learning.
- • **Master Complex Calculations:** 552 versatile functions from algebra to integration empower your toughest problems.

## Overview

The DUPOTA OA-991EX PLUS scientific calculator combines 552 advanced functions with a crisp 2-line LCD display and dual solar/battery power for reliable, high-speed calculations. Lightweight and durable, it’s designed for middle to high school students and professionals who demand accuracy and efficiency in complex math tasks.

## Description

Are you looking for a scientific calculators that can keep up with your learning pace? The DUPOTA 991EX PLUS is your ideal choice, combining advanced math functions with daily usability. This is a device that supports both solar and button battery power supply methods. Powered by solar panels when there is enough light, energy saving; while when there is insufficient light or long-term use, the button battery ensures that you can continue computing without worrying about power issues. With 552 functions, 10+2 digits and a 2-line display, they are perfect for any set of geometric figures, making mathematical equations easily applicable in education, the workplace and the home. The function calculator is equipped with a high-definition LCD display to ensure that the numbers are clear and easy to read. Even if the light is low, you can easily identify the calculation results, making it more convenient for you to use. In addition to basic calculation functions, this scientific calculator also has some smart functions, such as automatic storage, memory functions, etc. Make your calculation process more convenient and efficient. DUPOTA 991EX PLUS ll scientific calculator has become an indispensable tool in study, work and research with its excellent performance, rich functions and excellent quality. No matter what scenario you are in, it can provide you with accurate and fast calculation support. Come to  to buy it and let DUPOTA 991EX PLUS ll become your right assistant in study, work and research!

## Features

- 【552 Calculation Functions】Scientific calculators 991ex features 552 functions, including spreadsheet, exponential, matrix calculation, statistics, integration, algebra, complex number calculation, standard deviation, and more, suitable for handling complex equations and statistical data. From beginner to advanced courses, its practicality can meet the needs of various digital fields.
- 【High Resolution & Multi-line Display】991ex scientific calculator is equipped with a high-resolution multi-line display that supports natural display of mathematical formulas and fractions, presenting expressions intuitively and showing the calculation process and results simultaneously. Adjust the screen contrast according to your preference for a clear and comfortable experience.
- 【High-Efficiency Calculator】Scientific calculators has an integrated spreadsheet mode that supports data input and formula calculation; advanced operations such as 4×4 matrix and vector operations, with a quad-core processor to enhance calculation speed, making it faster to solve high-order equations and perform matrix operations, meeting the needs of efficient calculation.
- 【Long Battery Life & Durable】Fraction calculator has a dual power system of solar and button battery for long-lasting operation. It automatically shuts down after 8 minutes of inactivity. Sliding back cover protects the calculator body, making it pressure-resistant and durable, meeting the needs of high-intensity study and outdoor use, providing peace of mind in exam scenarios.
- 【Ultra-light & Portable】Advanced scientific calculators is designed to be lightweight (about 125g), suitable for carrying around. The button layout is clear, and the anti-slip material enhances the operation feel. It has various function keys to simplify complex calculations, including a "CHG" button for switching between fractions and decimals, making precise value calculations easy.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | DUPOTA |
| Manufacturer | DUPOTA CO.,LTD. |
| Model | OA-991EX PLUS |
| Model Name | OA-991EX PLUS |
| Product Dimensions | 16.51 x 8 x 0.25 cm; 125 g |
| Batteries | 1 LR44 batteries required. (included) |
| Item model number | OA-991EX PLUS |
| Standing screen display size | 2.5 Inches |
| Display Type | LCD |
| Power Source | Solar Powered |
| Batteries Included | Yes |
| Batteries Required | Yes |
| Battery cell composition | Alkaline |
| Material | Plastic |
| Includes Rechargeable Battery | No |
| Manufacturer | DUPOTA CO.,LTD. |
| Country of Origin | China |
| Item Weight | 125 g |

## Product Details

- **Brand:** DUPOTA
- **Colour:** black
- **Calculator Type:** Engineering/Scientific
- **Power Source:** Solar Powered
- **Screen Size:** 2.5 Inches

## Images

![Scientific Calculator 552 Functions 2-Line 10+2 Digits Written Display Solar Battery - Ideal for Middle High School Students and Teachers, Black (OA-991EX Plus) - Image 1](https://m.media-amazon.com/images/I/71edBbg+O4L.jpg)

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*Product available on Desertcart Spain*
*Store origin: ES*
*Last updated: 2026-02-23*