---
product_id: 583310733
title: "Scientific Calculator 417 Function 2 Line 10+2 Digits Written Display Solar and Battery Calculators for Students Secondary School College Black (OS 991ES Plus 2nd Edition)"
brand: "osalo"
price: "€ 48.61"
currency: EUR
in_stock: true
reviews_count: 13
category: "Osalo"
url: https://www.desertcart.nl/products/583310733-scientific-calculator-417-function-2-line-10-2-digits-written
store_origin: NL
region: Netherlands
---

# Dual solar & battery power 417 advanced functions 2-line written display Scientific Calculator 417 Function 2 Line 10+2 Digits Written Display Solar and Battery Calculators for Students Secondary School College Black (OS 991ES Plus 2nd Edition)

**Brand:** osalo
**Price:** € 48.61
**Availability:** ✅ In Stock

## Summary

> 📚 Calculate smarter, not harder — your ultimate study sidekick!

## Quick Answers

- **What is this?** Scientific Calculator 417 Function 2 Line 10+2 Digits Written Display Solar and Battery Calculators for Students Secondary School College Black (OS 991ES Plus 2nd Edition) by osalo
- **How much does it cost?** € 48.61 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nl](https://www.desertcart.nl/products/583310733-scientific-calculator-417-function-2-line-10-2-digits-written)

## Best For

- osalo enthusiasts

## Why This Product

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

## Key Features

- • **Sleek & Portable:** Ultra-light 145g design with a protective slide-on case fits perfectly in your backpack or hand.
- • **Read Like a Textbook:** 2-line written display mirrors textbook notation for effortless input and error-free calculations.
- • **Master Every Equation:** 417 versatile scientific functions from algebra to statistics cover all your academic needs.
- • **Power That Never Quits:** Dual solar and battery power ensures uninterrupted performance wherever you go.
- • **Eye-Friendly Brightness:** Adjustable screen brightness reduces eye strain during marathon study sessions.

## Overview

The OSALO Scientific Calculator OS-991ES Plus 2nd Edition offers 417 functions including fractions, matrices, and complex numbers, displayed on a 2-line written format screen. It features adjustable brightness and dual solar-battery power for reliability. Lightweight and portable with a protective case, it’s designed for students from secondary school to college aiming for precision and efficiency in their calculations.

## Description

OSALO Scientific Calculator 417 Function 2 Line 10+2 Digits Written Display Solar and Battery Calculators for Students Secondary School College Black (OS 991ES Plus 2nd Edition): desertcart.co.uk: Stationery & Office Supplies

Review: Good Calculator - A simple and easy to use product which does the job for my daughter who has just started secondary school. I would recommend this for anyone else.
Review: Does exactly what you want it to do - Sturdy calculator. Doesnt feel cheap or anything which is great. Its very easy to use. Didnt take little getting used to but the instruction of the buttons on the inside of the case do massively help. Took this into my Level 2 Electrical exam and passed being able to comfortable answer all questions that had equations. Highly recommend

## Features

- 【417 Functions Scientific Calculator】With 417 functions for fractions, exponents, matrix calculations, statistics, integral, algebra, complex number calculations, standard deviation, solving for variables, permutations and combinations, and linear regression, Scientific Calculator covers most of the scientific functions that students from middle school through college will need to use in their courses and on exams. Reading instruction attached will help you know how to use and find these functions.
- 【Written Display Scientific Calculator】Input expressions and arithmetic operations same as written form in the textbook, which is more easy to read than traditional calculators. The 2 line display shows both input and calculation results,convenient for students to check the calculation process and results.
- 【Brightness Adjustment Function】The screen brightness can be adjusted by simple operation to get the best display effect, dimming to relieve eye fatigue, brightening to get clearer display results, to improve the calculation efficiency.
- 【Dual Power Source Electronic Calculator】Solar and battery,double safe uninterruptible power,environmental protection and energy saving advantages.
- 【Ultra-light & Portable】Weight: 5.1oz. (145g); Size: 164 x 80 x 17(mm)/6.4 x 3.15 x 0.6 7(inch); Material: ABS plastic. With slide-on hard case, convenient to carry it outside and hold it on one hand.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CJLC75XS |
| Best Sellers Rank | 5,253 in Stationery & Office Supplies ( See Top 100 in Stationery & Office Supplies ) 24 in Scientific Calculators |
| Guaranteed software updates until | unknown |
| Item model number | OS-991ES PLUS II |
| Manufacturer | Osalo co., ltd |
| Product Dimensions | 16.4 x 1.7 x 0.1 cm; 150 g |

## Product Details

- **Brand:** OSALO
- **Calculator Type:** Engineering/Scientific
- **Colour:** black
- **Display type:** LCD
- **Material:** Plastic
- **Model name:** OS 991ES Plus 2nd Edition
- **Number of batteries:** 1 LR44 batteries required. (included)
- **Power source:** Battery & Solar
- **Product dimensions:** 16.4L x 1.7W centimetres
- **Screen size:** 6

## Images

![Scientific Calculator 417 Function 2 Line 10+2 Digits Written Display Solar and Battery Calculators for Students Secondary School College Black (OS 991ES Plus 2nd Edition) - Image 1](https://m.media-amazon.com/images/I/71hSDGrjRzL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good Calculator
*by F***D on 19 January 2026*

A simple and easy to use product which does the job for my daughter who has just started secondary school. I would recommend this for anyone else.

### ⭐⭐⭐⭐⭐ Does exactly what you want it to do
*by M***E on 24 June 2025*

Sturdy calculator. Doesnt feel cheap or anything which is great. Its very easy to use. Didnt take little getting used to but the instruction of the buttons on the inside of the case do massively help. Took this into my Level 2 Electrical exam and passed being able to comfortable answer all questions that had equations. Highly recommend

### ⭐⭐⭐⭐⭐ Amazing calculator
*by G***4 on 6 April 2025*

Very useful for my son's exam this year.

## Frequently Bought Together

- OSALO Scientific Calculator 417 Function 2 Line 10+2 Digits Written Display Solar and Battery Calculators for Students Secondary School College Black (OS 991ES Plus 2nd Edition)
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*Product available on Desertcart Netherlands*
*Store origin: NL*
*Last updated: 2026-03-01*