Which scientific instrument's mass production and retail marketing in the 1920s-30s revolutionized home science education and led to the first major consumer 'science hobby' trend?

In the intersection of science retail and consumer trends, specialized scientific equipment has created its own unique marketplace. Scientific instrument retailers have evolved dramatically over the centuries, from simple optical shops to global enterprises. This trivia question explores a pivotal moment when scientific retail marketing transformed the accessibility and popularity of a key instrument.

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Home Chemistry Sets
Amateur Microscopes
Telescope Kits
Radio Building Sets