Which scientific testing device was first successfully miniaturized for widespread in-store retail use, allowing customers to verify product effectiveness before purchase?

The intersection of retail and science has led to revolutionary changes in how consumers interact with products before purchase. Scientific testing equipment that was once confined to laboratories has been miniaturized and adapted for retail environments, allowing customers to verify product claims on the spot. This poll tests your knowledge about a pioneering technology that changed how consumers shop for a specific type of scientific product.

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UV Protection Analyzers (for testing sunscreen SPF claims)
Portable DNA Sequencers (for testing ancestry kit accuracy)
Mini Spectrometers (for testing vitamin supplement potency)
Handheld Air Quality Monitors (for testing air purifier effectiveness)