Which of these common consumer products was originally developed as scientific laboratory equipment before being rebranded and marketed to the general public?

The boundary between scientific equipment and consumer products has blurred over decades as technologies developed for research labs found their way to retail shelves. Many items we now take for granted began as specialized scientific tools before clever marketing transformed them into household essentials. This trivia question explores a fascinating example of how scientific innovation was rebranded and commercialized for the mass market.

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Microwave oven (originally magnetron radar equipment)
Liquid hand soap (originally laboratory detergent)
Post-it notes (originally lab specimen markers)
Teflon cookware (originally telescope lens coating)