--- product_id: 583310733 title: "– OSALO Scientific Calculator 417 Functions GCSE School Black OS-991ES PLUS 2" brand: "osalo" price: "¥9139" currency: JPY in_stock: true reviews_count: 13 url: https://www.desertcart.jp/products/583310733-osalo-scientific-calculator-417-functions-gcse-school-black-os-991es store_origin: JP region: Japan --- # dual solar & battery power 2-line written display 417 advanced functions – OSALO Scientific Calculator 417 Functions GCSE School Black OS-991ES PLUS 2 **Brand:** osalo **Price:** ¥9139 **Availability:** ✅ In Stock ## Summary > 📐 Elevate your calculations—because precision is the new power move. ## Quick Answers - **What is this?** – OSALO Scientific Calculator 417 Functions GCSE School Black OS-991ES PLUS 2 by osalo - **How much does it cost?** ¥9139 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/583310733-osalo-scientific-calculator-417-functions-gcse-school-black-os-991es) ## 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 - • **Master Every Equation:** 417 versatile functions from algebra to statistics cover all your academic and professional needs. - • **Power That Never Quits:** Dual solar and battery power ensures uninterrupted performance wherever you study or work. - • **Eye-Friendly Brightness:** Adjustable screen brightness reduces eye strain during long study sessions or late-night crunch time. - • **See It Like Your Textbook:** 2-line written display mirrors textbook notation for effortless input and error-free calculations. - • **Carry Smart, Calculate Smarter:** Ultra-lightweight design with a protective slide-on case fits perfectly in your bag or hand for on-the-go success. ## Overview The OSALO Scientific Calculator OS-991ES PLUS 2 offers 417 functions including fractions, matrices, and statistics, with a 2-line written display for easy reading. Powered by both solar and battery sources, it features adjustable brightness and a lightweight, portable design with a protective case—ideal for students and professionals aiming for flawless, efficient calculations. ## Description "Effortlessly Crunch Numbers with Precision: Introducing the Ultimate OSALO Calculator!" OSALO is a brand that is all about functionality and design. It was founded by a team of engineers who wanted to create high-quality calculators that are both stylish and easy to use. Whether you are a student, a professional or just need a calculator for everyday use, OSALO has the perfect product for your needs. OSALO calculator brand is focused on innovation, quality, and reliability. Our brand philosophy is inspired by the idea of "Simplicity in Complexity." OSALO embraces innovation as a core value in our products. We are constantly developing new technologies and features that provide improved functionality and convenience to users. Some of these innovations include touchscreen displays, ergonomic designs, and advanced mathematical functions. Osalo OS-991es Plus 2nd Edition Scientific Calculator features a sleek design and slide-out hard case with a written display and screen brightness (manual) adjustment functions. There are 417 functions: including basic and advanced science, exponential and trigonometric, fractions, regression analysis, table function and more. It's perfect for middle school to college students studying general maths, integral calculation, statistics, algebra, geometry and physics. Solar & Battery power supply. Written display expression, convenient for students to check the calculation process and results. Solar and battery, double safe uninterruptible power, and energy-saving advantages. Keys in the different areas have different shapes, are very sensitive. The letters printed on keys are pretty clear. It has 417 functions and covers most of the needs of scientific functions that students may need in math, physics, chemistry, etc. Calculator 401 Function Calculator 252 Functions Calculator 240 Function Desktop Calculator Desktop Calculator ## 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 | 1,415 in Stationery & Office Supplies (See Top 100 in Stationery & Office Supplies) 7 in Scientific Calculators | | Brand Name | OSALO | | Calculator Type | Engineering/Scientific | | Colour | black | | Country Of Origin | China | | Customer Reviews | 4.4 4.4 out of 5 stars (753) 4.4 out of 5 stars | | Display Type | LCD | | Enclosure Material | Plastic | | Item Dimensions L X W | 16.4L x 1.7W centimetres | | Item Highlight | Math Scientific Calculator, 2-Line Written Display, Solar & Battery Power for GCSE, Secondary High School College | | Item Weight | 0.15 Kilograms | | Manufacturer | OSALO | | Manufacturer Part Number | OSALO CO.,LTD. | | Model Name | OS 991ES Plus 2nd Edition | | Model Number | OS-991ES PLUS II | | Number Of Batteries | 1 LR44 batteries required. (included) | | Number Of Items | 1 | | Power Source | Battery & Solar | | Screen Size | 6 | | Upc | 730637240479 | ## 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 ![– OSALO Scientific Calculator 417 Functions GCSE School Black OS-991ES PLUS 2 - Image 1](https://m.media-amazon.com/images/I/71hSDGrjRzL.jpg) ## Available Options This product comes in different **Style Name** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Good Calculator *by on Reviewed in the United Kingdom 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. ### ⭐⭐⭐⭐⭐ Quality & Useful *by on Reviewed in the United Kingdom 2 May 2026* Very Good ### ⭐⭐⭐⭐⭐ Does exactly what you want it to do *by on Reviewed in the United Kingdom 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 ## 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) - BIC 4 Colours Original Pens, Multi Coloured Pens All In One, Biro Pens, Medium 1.0mm, Green, Blue, Red, Black, 3 Pens Per Pack, 1 Pack - Zamasha Clear Pencil Case Black | 22x4x9 cm Stylish, Practical and Transparent Pencil Case | Versatile Storage for Stationery, Toiletries, Makeup, Travel & Office Supplies --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.jp/products/583310733-osalo-scientific-calculator-417-functions-gcse-school-black-os-991es](https://www.desertcart.jp/products/583310733-osalo-scientific-calculator-417-functions-gcse-school-black-os-991es) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-09-29*