Texas Instruments TI-81 Graphing Calculator

The Texas Instruments TI-81 is a classic graphing calculator designed for algebra, trigonometry, and pre-calculus coursework. With a large LCD display and user-friendly interface, the TI-81 allows students to plot graphs, perform complex equations, and visualize mathematical concepts with ease. It’s an ideal tool for classrooms, test prep, or professional use where reliability and precision matter.

Key Features:

• Graph multiple functions and analyze intersections, roots, and maximum/minimum points
• Handles scientific, trigonometric, logarithmic, and statistical calculations
• Built-in matrix and list operations for algebraic problem solving
• LCD display with clear, high-contrast viewing for graphs and data
• Battery-powered portability with long-lasting performance

Refurbishment & Warranty:

• Fully refurbished and tested by Porter Electronics technicians for accuracy and reliability
• Cleaned, inspected, and guaranteed to function like new
• Backed by a 90-Day Exchange Warranty for peace of mind

What’s Included:

• Texas Instruments TI-81 Graphing Calculator
• Protective slide cover
• Downloadable user manual

Ideal For:

• High school and college students in algebra, trigonometry, and pre-calculus
• Teachers looking for reliable classroom calculators
• Professionals and hobbyists who prefer vintage TI performance and design