CTIFREE 991ES PLUS Professional Scientific Calculator-417 Functions

Key Features :

• Advanced 417 Scientific FunctionsThe All-in-One Mathematical Solution: From basic arithmetic to advanced vector calculations, matrix operations, and integration/differentiation, this calculator covers every requirement for curriculum exams and professional field work.
  
• Intelligent Solar & Battery Dual PowerAlways Ready When You Need It: Features a high-efficiency solar panel for daylight operation and a reliable battery backup for dim environments, ensuring you never run out of power during a 3-hour exam.
  
• Natural Textbook (V.P.A.M.) DisplayVisualize Math Like Never Before: The high-resolution 10+2 digit dot-matrix screen displays formulas and symbols in their natural mathematical format, making result reading intuitive and effortless.
  
• 40 Scientific Constants & 40 Unit ConversionsYour Essential Exam Assistant: The protective slide-on hard case features a quick-reference guide for physics constants and unit conversions, providing instant support for complex problem-solving.
  
• Durable Design with Hard Slide-On CoverBuilt to Withstand Student Life: Crafted from high-impact ABS plastic with responsive, non-fade keys. The included sliding protective cover shields the screen and keypad from scratches, drops, and dust in your backpack.
  

Product Specifications:

• Model: 991ES PLUS (2nd Edition Style)
• Functions: 417 Scientific Functions
• Display: 10 + 2 Digit Natural Textbook Display
• Power Source: Solar Panel + LR44 Battery (Included)
• Dimensions: 161.5mm x 77mm x 11mm
• Weight: 113g
• Material: High-Grade ABS with Matte Texture

What's in the box
1 x 991ES PLUS Scientific Calculator