{"product_id":"roatee-rechargeable-scientific-calculator-991es-with-lcd-notepad-417-functions-multiview-display","title":"ROATEE Rechargeable Scientific Calculator 991ES with LCD Notepad — 417 Functions, Multiview Display","description":"\u003cp\u003e\u003cstrong\u003eThe ROATEE 991ES is a rechargeable, 417-function scientific calculator with a built-in LCD notepad and multiview screen designed for students and professionals.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis compact calculator combines extensive math capabilities with a small writable LCD notepad and a protective anti-drop body. It supports a wide range of topics from basic algebra and geometry to calculus, complex numbers, matrices and base-n conversions, while offering a multiview display for up to four simultaneous calculations. Dual power (rechargeable battery plus replaceable coin cell) keeps it ready for exams, labs, classroom use and office tasks.\u003c\/p\u003e\n\n\u003ch3\u003eWhat math and science problems can the ROATEE 991ES handle?\u003c\/h3\u003e\n\n\u003cp\u003eThe 991ES covers core school and many advanced technical functions: arithmetic, algebra, trigonometry, statistics, calculus, matrix and vector operations, complex numbers, table and equation solvers, and base-N conversions. It is built to handle coursework from pre-algebra through college-level topics.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e417 built-in functions including EQN, MATRIX, VECTOR and SOLVE\u003c\/li\u003e\n  \u003cli\u003eCalculations for fractions, decimals, regression and statistics\u003c\/li\u003e\n  \u003cli\u003eSupport for BASE-N: binary, octal, decimal, hexadecimal\u003c\/li\u003e\n  \u003cli\u003eComplex number and calculus-related routines\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does the integrated notepad improve study and workflow?\u003c\/h3\u003e\n\n\u003cp\u003eThe embedded LCD writing tablet with stylus lets you jot quick notes, intermediate steps or reminders without paper. Unlocking the lock key enables the pad and erase button, so you can preserve results on the calculator screen while keeping scratch work visible.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eStylus and LCD pad for on-device notes and diagrams\u003c\/li\u003e\n  \u003cli\u003eSeparate erase control (requires unlock) to avoid accidental clears\u003c\/li\u003e\n  \u003cli\u003eAllows referencing calculations and notes side-by-side\u003c\/li\u003e\n  \u003cli\u003eReduces need for loose scrap paper during practice\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow reliable and portable is the 991ES for school or travel?\u003c\/h3\u003e\n\n\u003cp\u003eConstructed with an anti-drop casing and tested for durability, the 991ES is lightweight and pocketable at roughly 5 ounces. Its dual power setup helps avoid interruptions: recharge the internal battery or replace the coin battery if needed, making it suitable for classrooms, labs and field use.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eAnti-drop body minimizes damage from accidental falls\u003c\/li\u003e\n  \u003cli\u003eRechargeable internal battery plus replaceable coin cell backup\u003c\/li\u003e\n  \u003cli\u003eCompact, lightweight design fits backpacks and pockets\u003c\/li\u003e\n  \u003cli\u003eIncludes protective packing case for transportation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat display and usability features make it efficient?\u003c\/h3\u003e\n\n\u003cp\u003eThe multiview screen displays up to four calculations simultaneously to speed comparisons and multi-step problems. A clear button layout and memory functions help manage intermediate values, while the included instruction guide explains advanced operations.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eMultiview shows four calculations on-screen at once\u003c\/li\u003e\n  \u003cli\u003eMemory function stores intermediate results for reuse\u003c\/li\u003e\n  \u003cli\u003eLogical button layout for quick access to advanced modes\u003c\/li\u003e\n  \u003cli\u003eComes with instructions, packing box and carrying case\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? The ROATEE 991ES is designed for middle and high school students, college undergraduates, teachers and professionals who need a versatile scientific calculator with extra note-taking convenience. It’s especially useful for users who want a durable, rechargeable device that handles a wide range of coursework and technical calculations without carrying multiple tools.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is the ROATEE 991ES rechargeable and does it have a backup battery?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It has a rechargeable internal battery and a replaceable coin cell backup for uninterrupted use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I use the notepad while locked?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. The writing area and erase button only work when you unlock the lock key.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"ROATEE","offers":[{"title":"Default Title","offer_id":52904584347960,"sku":"B0B1V7YZ4S","price":87.88,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1012\/6799\/6984\/files\/roatee-991es-front-view.jpg?v=1788459407","url":"https:\/\/kelorix.ca\/products\/roatee-rechargeable-scientific-calculator-991es-with-lcd-notepad-417-functions-multiview-display","provider":"Kelorix Canada | Shop Home, Electronics, Beauty, Toys \u0026 More","version":"1.0","type":"link"}