Which scientific product design innovation was specifically created to address the problem of contamination during PCR (Polymerase Chain Reaction) processes?

In the world of scientific innovation, product design plays a crucial role in both functionality and adoption. Some scientific instruments and tools have become iconic not just for their capabilities but for their groundbreaking design approaches that changed how scientists work. Test your knowledge about famous scientific product designs that revolutionized research and laboratory practices!

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The micropipette with disposable tips
The Erlenmeyer flask's conical design
The digital pH meter with replaceable probes
The bunsen burner with adjustable flame