2-in-1 Scientific Calculator with Digital Writing Tablet for Smarter Study Sessions

This versatile 417-function scientific calculator combines advanced mathematical computing with an integrated LCD writing tablet and stylus pen. Designed to support general math, algebra, geometry, statistics, calculus, and matrix operations, it displays up to four lines of calculations simultaneously for optimal workflow efficiency.

Built with a durable, anti-drop body weighing only 141.7 g, it offers maximum portability for classroom, lab, or office use. The dual-power system utilizes a built-in rechargeable battery alongside a solar panel to ensure continuous, reliable operation without frequent battery replacements.

Key Features

Highlights

• 991ES MAX Multifunctional Scientific Calculator: Features 417 functions, ideal for: General math and science, Pre-Algebra, Algebra 1 and 2, Geometry, Statistics and regression calculations, Calculus, fractions, decimals, calculations involving specific number systems (BASE-N, binary, octal, decimal, hexadecimal), complex number calculations, EQN, MATRIX, TABLE, VECTOR, SOLVE, Biology, Chemistry, and more. Includes memory function.
• Scientific Calculator with Notepad: Integrates calculation and notebook with a stylus pen. The LCD writing tablet enables note-taking during calculation. Note: Only unlock the LOCK KEY for the writing area and erase button to function.
• Multiview: Display shows 4 calculations at the same time on screen to improve computational efficiency.
• Dual Power Solar Panel & Rechargeable: Built-in rechargeable battery reduces battery replacement frequency. Also powered by solar energy.
• Anti-Drop Body with High Durability and Portable: Designed with an anti-drop body. Weighs 5 ounces for portability.
• Conversion of Fraction and Decimal: Results can be changed through the 'S⇔D' key. Calculator settings can be configured: 1. Press 'SHIFT'. 2. Press 'MODE'. 3. Choose 1 or 2 to set the mode of fraction or decimal (MthIO for fraction, LineIO for decimal).
• Usage Tips: The default initial input/output mode is MathI (input) / MathO (output), designed to display expressions in the same way as textbooks (Natural Textbook). To switch the output mode: Press [Shift] → [Function] → [1] (select input/output mode) → [2] (decimal output mode) or [3] (linear output mode).
• Package Contents: 991ES MAX scientific calculator, USB-C charging cable, instructions, and packing box.

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Materials & care

Wipe the calculator and LCD screen gently with a soft, dry microfiber cloth. Avoid exposure to extreme heat, moisture, and sharp objects that may scratch the writing surface.

How to use

Unlock the writing pad using the lock switch to enable drawing and single-click erasing with the stylus. To switch output display between fractions and decimals, press the S⇔D key, or access the setup menu by pressing [Shift] followed by [Mode] or [Function] to select your preferred input/output format.

What's included

• 991ES MAX scientific calculator
• USB-C charging cable
• Instructions
• Packing box