--- product_id: 583310733 title: "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)" brand: "osalo" price: "£28.74" currency: GBP in_stock: true reviews_count: 13 category: "Osalo" url: https://www.desertcart.co.uk/products/583310733-osalo-scientific-calculator-417-function-2-line-10-2-digits store_origin: GB region: United Kingdom --- # Adjustable brightness display Dual solar & battery power 417 advanced functions 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) **Brand:** osalo **Price:** £28.74 **Availability:** ✅ In Stock ## Summary > 📚 Calculate smarter, not harder — your ultimate study sidekick! ## Quick Answers - **What is this?** 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) by osalo - **How much does it cost?** £28.74 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/583310733-osalo-scientific-calculator-417-function-2-line-10-2-digits) ## 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 - • **Read Like a Pro:** 2-line written display mirrors textbook notation for error-free input and instant result verification. - • **Sleek & Portable:** Ultra-light 145g design with a durable slide-on case fits perfectly in your backpack or hand. - • **Master Every Equation:** 417 versatile scientific functions from algebra to regression cover all your academic needs. - • **Power That Never Quits:** Dual solar and battery power ensures uninterrupted performance wherever you go. - • **Eye-Friendly Brightness:** Customizable screen brightness reduces eye strain during marathon study sessions. ## Overview The OSALO OS-991ES Plus 2nd Edition Scientific Calculator packs 417 functions including fractions, algebra, statistics, and regression into a sleek, portable design. Featuring a 2-line written display for textbook-style input, adjustable brightness for eye comfort, and dual solar-battery power for reliability, it’s engineered to support middle school through college students in mastering complex calculations with ease. ## Description Product Description Multiple Applications 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. Easy Read Written Display Written display expression, convenient for students to check the calculation process and results. Dual Power Supply Solar and battery, double safe uninterruptible power, and energy-saving advantages. Premium Sensitive Keys Keys in the different areas have different shapes, are very sensitive. The letters printed on keys are pretty clear. With ABS Slide Case It has 417 functions and covers most of the needs of scientific functions that students may need in math, physics, chemistry, etc. OSALO Calculator Calculator 401 Function Calculator 252 Functions Calculator 240 Function Desktop Calculator 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 | 1,998 in Stationery & Office Supplies ( See Top 100 in Stationery & Office Supplies ) 11 in Scientific Calculators | | Brand | OSALO | | Brand Name | OSALO | | Calculator Type | Engineering/Scientific | | Colour | black | | Country of Origin | China | | Customer Reviews | 4.5 out of 5 stars 734 Reviews | | Display Type | LCD | | Enclosure Material | Plastic | | Item Dimensions L x W | 16.4L x 1.7W centimetres | | 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 batteries | 1 LR44 batteries required. (included) | | Power Source | Battery & Solar | | Power source | Battery & Solar | | Screen Size | 6 | | 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 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) ![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) - Image 2](https://m.media-amazon.com/images/I/71Q6szsTYXL.jpg) ![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) - Image 3](https://m.media-amazon.com/images/I/710xaqYJEnL.jpg) ![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) - Image 4](https://m.media-amazon.com/images/I/71iB2jQCLVL.jpg) ![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) - Image 5](https://m.media-amazon.com/images/I/71KjBoVxsuL.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 ### ⭐⭐⭐⭐ Cheaper than Casio but does the same *by P***X on 26 July 2024* Casio is the brand but it was about £10 more than this one and so far (last 6 months) this has functioned perfectly well and no issues at all. Definitely good value for money. Hope that helps. ## 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.co.uk/products/583310733-osalo-scientific-calculator-417-function-2-line-10-2-digits](https://www.desertcart.co.uk/products/583310733-osalo-scientific-calculator-417-function-2-line-10-2-digits) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-07-02*