Which mathematical product innovation, first introduced in the 1970s, democratized access to complex calculations and significantly transformed mathematics education and practice?

The development of mathematical tools and products has transformed education and professional practice throughout history. From ancient calculating devices to modern software, mathematical product innovation has shaped how we learn, teach, and apply mathematical concepts. This trivia question explores a significant innovation in the mathematics education industry that revolutionized access to advanced calculations for students and professionals alike.

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The graphing calculator (with Texas Instruments' TI-81 becoming a classroom staple)
The digital protractor (allowing for precise angle measurements without manual alignment)
The magnetic algebra tile sets (creating physical representations of abstract equations)
The digital compass (eliminating the need for manual circle drawing in geometry)