---
product_id: 648702565
title: "991EX Scientific Calculator with Advanced 550 Functions- Solar & Battery Powered, Multi-Function, High School & College Math, Trigonometry, Statistics, Algebra, Durable, Large Display"
brand: "catiga"
price: "₱4648"
currency: PHP
in_stock: true
reviews_count: 13
category: "Catiga"
url: https://www.desertcart.ph/products/648702565-991ex-scientific-calculator-with-advanced-550-functions-solar-and-battery
store_origin: PH
region: Philippines
---

# 32% larger high-res display dual solar & battery power 552 advanced functions 991EX Scientific Calculator with Advanced 550 Functions- Solar & Battery Powered, Multi-Function, High School & College Math, Trigonometry, Statistics, Algebra, Durable, Large Display

**Brand:** catiga
**Price:** ₱4648
**Availability:** ✅ In Stock

## Summary

> 📊 Elevate your calculations—because precision is the new power move.

## Quick Answers

- **What is this?** 991EX Scientific Calculator with Advanced 550 Functions- Solar & Battery Powered, Multi-Function, High School & College Math, Trigonometry, Statistics, Algebra, Durable, Large Display by catiga
- **How much does it cost?** ₱4648 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ph](https://www.desertcart.ph/products/648702565-991ex-scientific-calculator-with-advanced-550-functions-solar-and-battery)

## Best For

- catiga enthusiasts

## Why This Product

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

## Key Features

- • **Unstoppable Power Duo:** Solar plus battery backup ensures your calculator never quits on you.
- • **Textbook-Style Display:** See formulas exactly as in your textbooks for flawless understanding.
- • **Master 552 Functions with Ease:** From calculus to complex numbers, conquer every equation effortlessly.
- • **Visual Clarity on a Big Screen:** 32% larger high-res display means no more squinting at tiny numbers.
- • **Built to Last Through Every Exam:** Durable design engineered for relentless daily use and reliability.

## Overview

The CATIGA SS-991EX is a robust scientific calculator featuring 552 advanced functions including calculus, statistics, and matrix operations. It boasts a 32% larger high-resolution display for clear, textbook-style formula visualization, powered by both solar and battery sources for uninterrupted use. Designed for durability and precision, it’s ideal for high school and college students tackling complex math and science courses.

## Description

CATIGA SS-991EX Scientific Calculator with Advanced 550 Functions- Solar & Battery Powered, Multi-Function, High School & College Math, Trigonometry, Statistics, Algebra, Durable, Large Display: desertcart.co.uk: Stationery & Office Supplies

Review: Best product - This is one best product if you're looking for a good scientic calculator
Review: Good calculator - It’s a great item.

## Features

- Comprehensive 552 Functions: Includes spreadsheet, matrix, statistics, calculus, complex numbers, equations, standard deviation, vectors, permutations and combinations; suitable for biology, chemistry, physics, finance and business courses; ideal for both beginners and advanced users
- USER FRIENDLY FORMAT: Displays formulas and expressions as they appear in textbooks, simplifying learning and problem-solving. This feature ensures that complex equations are presented in a clear, structured manner, making it easier for users to follow along and verify their work, ultimately enhancing accuracy and understanding in both educational and professional settings
- LARGE HIGH RESOLUTION SCREEN: The high-resolution LCD display is 32% larger than regular two-line calculators, showing intricate details ideal for advanced operations such as spreadsheets and 4x4 matrix calculations. The spacious screen allows graphs and equations to be displayed simultaneously, enhancing the clarity and precision of your work
- DUAL POWER SOURCE: Features both solar power and a battery backup, guaranteeing continuous performance for crucial calculations, making it reliable and efficient for use in any environment
- DURABILITY and QUALITY: Engineered with strong materials, SS-991EX withstands extensive use, providing long-term reliability. If your calculator fails to turn on, try pressing the reset button on the back.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0D7VJMNJ9 |
| Best Sellers Rank | 19,561 in Stationery & Office Supplies ( See Top 100 in Stationery & Office Supplies ) 55 in Scientific Calculators |
| Guaranteed software updates until | unknown |
| Manufacturer | CATIGA |
| Manufacturer reference | SS-991EX |
| Product Dimensions | 16.41 x 8 x 0.1 cm; 170 g |

## Product Details

- **Brand:** CATIGA
- **Calculator Type:** Engineering/Scientific
- **Colour:** 2) 991-EX Black
- **Display type:** LCD
- **Material:** Plastic Or Metal Alloy
- **Model name:** CATIGA SS-991EX
- **Power source:** Battery Powered
- **Product dimensions:** 16.4L x 8W centimetres
- **Screen size:** 3 Inches
- **UPC:** 813629025138 813629023745

## Images

![991EX Scientific Calculator with Advanced 550 Functions- Solar & Battery Powered, Multi-Function, High School & College Math, Trigonometry, Statistics, Algebra, Durable, Large Display - Image 1](https://m.media-amazon.com/images/I/71VPpk3aloL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Best product
*by A***I on 9 February 2026*

This is one best product if you're looking for a good scientic calculator

### ⭐⭐⭐⭐⭐ Good calculator
*by A***R on 8 February 2026*

It’s a great item.

### ⭐⭐⭐⭐ Scientists?
*by A***N on 2 November 2025*

If you want a scientific calculator that does the job, bearing in mind, that, I have, as of yet not explored all of its' capabilities, this one will probably do! I am currently working on my pet subject, that being Trickynometry, and am pleased to report, that it does not calculate in blasted washing powder! I have given it a 4 star rating, as to achieve 5 stars, it would have to be, what is termed as a "model" calculator! I wish "A level examiners" were aware of this! They were, when I took mine! In conclusion, the calculator will do!

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**Shop now:** [https://www.desertcart.ph/products/648702565-991ex-scientific-calculator-with-advanced-550-functions-solar-and-battery](https://www.desertcart.ph/products/648702565-991ex-scientific-calculator-with-advanced-550-functions-solar-and-battery)

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*Product available on Desertcart Philippines*
*Store origin: PH*
*Last updated: 2026-03-09*