Which scientific product launch included a deliberate manufacturing defect that was later discovered to actually improve performance, leading to its intentional inclusion in all future models?

The launch of scientific instruments and research tools often represents years of development and innovation. Behind every major scientific breakthrough are the tools that made it possible. This trivia question explores a notable product launch that changed how scientists conduct their research and expanded our understanding of the natural world. Test your knowledge of pivotal moments in scientific instrumentation history!

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The Scanning Tunneling Microscope (1981), which had an accidental voltage fluctuation circuit that improved atomic resolution
The Hubble Space Telescope's mirror (post-1993 repair), which retained a slight asymmetry that enhanced deep field imaging
The PCR machine (1983), which had imprecise temperature cycling that unexpectedly increased DNA amplification efficiency
The Mass Spectrometer (1960s model), which contained a manufacturing anomaly in the ion detector that improved isotope differentiation