---
product_id: 105218503
title: "CATIGA Black Scientific Calculator with Textbook-Style HD Display, Solar & Battery Scientific Calculators for College, High School & Engineering Students, Icon Menu & Magnetic Hard Case, CS-991NX"
brand: "catiga"
price: "$54.10"
currency: USD
in_stock: true
category: "Catiga"
url: https://www.desertcart.us/products/105218503-catiga-black-scientific-calculator-with-textbook-style-hd-display-solar
store_origin: US
region: United States of America
---

# HD Textbook-Style Display Dual Solar + Battery Power Magnetic Hard Case CATIGA Black Scientific Calculator with Textbook-Style HD Display, Solar & Battery Scientific Calculators for College, High School & Engineering Students, Icon Menu & Magnetic Hard Case, CS-991NX

**Brand:** catiga
**Price:** $54.10
**Availability:** ✅ In Stock

## Summary

> 📐 Master every equation with clarity and confidence—your ultimate study sidekick!

## Quick Answers

- **What is this?** CATIGA Black Scientific Calculator with Textbook-Style HD Display, Solar & Battery Scientific Calculators for College, High School & Engineering Students, Icon Menu & Magnetic Hard Case, CS-991NX by catiga
- **How much does it cost?** $54.10 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/105218503-catiga-black-scientific-calculator-with-textbook-style-hd-display-solar)

## 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 Combo:** Solar-powered with battery backup means zero downtime during critical tests—always exam-ready.
- • **Slim, Light & Exam-Ready:** Compact 0.21 lbs design fits effortlessly in your bag, with durable keys built for years of daily use.
- • **See Math Like Your Textbook:** Crisp 4-gradation HD display shows fractions, roots, and equations exactly as written—no more decoding flat lines.
- • **Built to Survive Your Backpack:** Rigid magnetic snap-on hard case stays secure and protects your calculator through every commute and exam.
- • **All-in-One Scientific Powerhouse:** 538 functions covering everything from Algebra to Engineering—ditch the second calculator forever.

## Overview

The CATIGA CS-991NX scientific calculator features a high-resolution textbook-style LCD display, 538 versatile functions for math and science, and a durable magnetic hard case. Powered by solar energy with battery backup, it ensures uninterrupted use during exams. Its slim, lightweight design is tailored for students from high school to engineering, making it a reliable, all-in-one tool for complex calculations and test day readiness.

## Description

desertcart.com : CATIGA Black Scientific Calculator with Textbook-Style HD Display, Solar & Battery Scientific Calculators for College, High School & Engineering Students, Icon Menu & Magnetic Hard Case, CS-991NX : Office Products

## Features

- TEXTBOOK-STYLE HD DISPLAY - SEE MATH THE WAY IT'S WRITTEN: A crisp high-resolution screen with 4-gradation shading shows fractions, roots, exponents and equations exactly as they appear in your textbook, not squeezed onto one flat line. An intuitive icon menu switches between Calculate, Statistics, Distribution, Spreadsheet, Table and Equation modes in one tap, so input is faster and mistakes are easier to catch
- 538 FUNCTIONS - EVERY TOOL FOR EVERY COURSE: One scientific calculator covers General Math and Pre-Algebra through Algebra, Geometry, Trigonometry, Statistics and Calculus, plus Physics, Chemistry and Engineering. Handles matrices and vectors, complex numbers, equation and inequality solving, a built-in spreadsheet, statistics with regression and distributions, base-n, prime factorization, 47 scientific constants and 40 units conversions, you never need a second device as your classes get harder
- MAGNETIC HARD CASE INCLUDED - PROTECTION THAT STAYS ON: Unlike calculators that ship with a flimsy slide-on cover, the CS-991NX comes with a rigid magnetic snap-on hard case. It clicks securely into place, survives being tossed in a backpack or pencil case, and won't slip off - so your calculator stays exam-ready year after year
- DUAL SOLAR + BATTERY POWER - NEVER DIES MID-EXAM: This solar calculator runs on light whenever it's available, with battery backup for everything else. No surprise shutdowns during a test, no scrambling for a replacement battery the night before an exam
- SLIM, LIGHT & BUILT FOR TEST DAY: At just 6.38 × 3.03 × 0.42 in and 0.21 lbs, this compact calculator slides into any bag or pencil case. Durable casing and responsive keys hold up to daily use through years of school. A dependable pick for college and high-school students prepping for SAT and AP coursework - always confirm your specific exam board's approved-equipment list as part of your prep

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0H75MY3G7 |
| Best Sellers Rank | #9,608 in Office Products ( See Top 100 in Office Products ) #25 in Scientific Calculators |
| Brand | CATIGA |
| Calculator Type | Engineering/Scientific |
| Color | Black |
| Customer Reviews | 4.6 4.6 out of 5 stars (602) |
| Display Type | LCD |
| Item Dimensions L x W | 6.5"L x 3.25"W |
| Manufacturer | CATIGA |
| Mfr Part Number | 991NX |
| Model Name | CS-991NX |
| Model Number | CS-991NX |
| Number of Batteries | 1 Nonstandard Battery batteries required. (included) |
| Number of Items | 1 |
| Power Source | Solar and Battery Powered |
| UPC | 810185461714 |
| Warranty Description | 1-Year Limited Manufacturer’s Warranty |

## Product Details

- **Brand:** CATIGA
- **Calculator Type:** Engineering/Scientific
- **Color:** Black
- **Number of Batteries:** 1 Nonstandard Battery batteries required. (included)
- **Power Source:** Solar and Battery Powered

## Images

![CATIGA Black Scientific Calculator with Textbook-Style HD Display, Solar & Battery Scientific Calculators for College, High School & Engineering Students, Icon Menu & Magnetic Hard Case, CS-991NX - Image 1](https://m.media-amazon.com/images/I/816cD6I6WJL.jpg)

## Available Options

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

## Questions & Answers

**Q: This is my first scientific calculator, how hard is it to learn?**
A: Most scientific calculators share the same underlying logic. Once you understand the core concepts, switching between models is easy — the icon-menu layout here makes that transition even smoother.

**Q: I need this to last through several years of school. Is it durable?**
A: Yes. The casing and keys are built to hold up to daily use — tossed in a backpack, pulled out between classes, used every day for years.

**Q: Can it handle statistics and table-based problems, not just basic arithmetic?**
A: Yes. It includes dedicated statistics and table modes for regression, data analysis and function tables, on top of standard scientific calculations.

**Q: How long does the battery last, and what if I run low mid-exam?**
A: It runs on dual power — as long as there's reasonable light it keeps working even if the battery is low.

**Q: Is this calculator suitable for exam prep?**
A: It's built to support the full range of practice you'll do while preparing. As with any calculator, permitted equipment varies by exam board, so check your specific exam's guidelines as part of your prep.

## Frequently Bought Together

- CATIGA Scientific Calculator 2 Line - for Math (Algebra and Trigonometry), Science, Statistics, Engineering, Physics, Business Class, Over 200 Functions, with Memory and Replay Function
- BIC Brite Liner Highlighters, Chisel Tip, 5-Count Pack of Highlighters Assorted Colors, Ideal Highlighter Set for Organizing and Coloring

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-09-14*