---
product_id: 653538830
title: "OA-991EX Plus Scientific Calculator 552 Functions 2-Line 10+2 Digits Written Display Solar Battery - Ideal for Middle High School Students and Teachers, Black"
brand: "dupota"
price: "€ 23.65"
currency: EUR
in_stock: true
url: https://www.desertcart.it/products/653538830-oa-991ex-plus-scientific-calculator-552-functions-2-line-10
store_origin: IT
region: Italy
---

# Quad-Core Processor High Resolution Display 552 Functions OA-991EX Plus Scientific Calculator 552 Functions 2-Line 10+2 Digits Written Display Solar Battery - Ideal for Middle High School Students and Teachers, Black

**Brand:** dupota
**Price:** € 23.65
**Availability:** ✅ In Stock

## Summary

> 📚 Elevate Your Math Game with the OA-991EX Plus!

## Quick Answers

- **What is this?** OA-991EX Plus Scientific Calculator 552 Functions 2-Line 10+2 Digits Written Display Solar Battery - Ideal for Middle High School Students and Teachers, Black by dupota
- **How much does it cost?** € 23.65 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.it](https://www.desertcart.it/products/653538830-oa-991ex-plus-scientific-calculator-552-functions-2-line-10)

## 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

- • **Built to Last:** Dual power system and durable design ensure reliability in any study environment.
- • **See It All Clearly:** High-resolution multi-line display for intuitive understanding of complex equations.
- • **Lightweight & Portable:** At just 125g, take your calculator anywhere and conquer your math tasks on the go!
- • **Speed Meets Efficiency:** Quad-core processor for lightning-fast calculations, perfect for high-order equations.
- • **Unleash Your Potential:** With 552 calculation functions, tackle any math challenge with ease!

## Overview

The OA-991EX Plus Scientific Calculator is a versatile tool designed for middle and high school students and teachers, featuring 552 functions, a high-resolution multi-line display, and a durable, lightweight design. With its dual power system and advanced processing capabilities, it meets the demands of both basic and complex calculations, making it an essential companion for academic success.

## Description

OA-991EX Plus Scientific Calculator 552 Functions 2-Line 10+2 Digits Written Display Solar Battery - Ideal for Middle High School Students and Teachers, Black

## 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 |
|---------------|-------|
| Number of Batteries | 1 LR44 batteries required. (included) |
| Display Type | LCD |
| Power Source | Solar Powered |
| Screen Size | 2.5 Inches |
| Calculator Type | Engineering/Scientific |
| Item Dimensions L x W | 6.5"L x 3.15"W |
| Material | Plastic |
| Color | black |

## Product Details

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

## Images

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

## Available Options

This product comes in different **Size** options.

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*Product available on Desertcart Italy*
*Store origin: IT*
*Last updated: 2026-01-26*