Which mathematical product development milestone was specifically marketed with the slogan 'Now anyone can do higher mathematics' when it was first introduced to the consumer market?

The development of educational mathematics products has a rich history of innovation. From ancient counting tools to modern digital platforms, these products have shaped how we learn and apply mathematical concepts. This trivia question focuses on a significant milestone in mathematical product development that revolutionized how students approach calculation and problem-solving. Test your knowledge about the evolution of mathematical learning tools!

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The slide rule (1600s)
The handheld electronic calculator (1970s)
The abacus (ancient times)
The graphing calculator (1980s)