Which mathematical product's packaging innovation led to a 300% sales increase when it introduced a clear viewing window allowing customers to test functionality before purchase?

In the world of mathematics education, product packaging plays a crucial role in attracting students and educators. From colorful geometry sets to elegantly designed calculators, the way mathematical tools are presented can significantly impact consumer perception and adoption. This trivia question explores a famous packaging innovation that revolutionized how we interact with a common mathematical tool.

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Texas Instruments' graphing calculator with transparent packaging showing the screen in demo mode
Staedtler's compass set with a try-me mechanical hinge visible through the package
Casio's scientific calculator with battery-powered sample calculations viewable through packaging
Oxford's protractor set with transparent material samples visible in the packaging window