Which common laboratory instrument was first successfully marketed to scientists through an innovative retail strategy that involved giving free samples to leading researchers at prestigious universities?

The scientific equipment industry has transformed dramatically over the decades, with many laboratory staples having fascinating origin stories. This poll explores how consumer product marketing and retail strategies have influenced the development and adoption of key scientific instruments. Test your knowledge about the intersection of scientific innovation and product marketing that revolutionized laboratory work worldwide.

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The micropipette (developed by Eppendorf), which revolutionized precise liquid handling after free samples were distributed to Nobel Prize winners in 1961
The pH meter (developed by Beckman Instruments), which gained popularity after being showcased at World's Fair exhibitions in the 1950s
The spectrophotometer (developed by Perkin-Elmer), which became standard after celebrity scientists endorsed it in television advertisements
The centrifuge (developed by Sorvall), which dominated the market after the company pioneered the money-back satisfaction guarantee for scientific equipment