Which scientific product development was NOT available to researchers before 1980?

Test your knowledge about groundbreaking products in scientific research! The development of scientific instruments and tools has revolutionized our understanding of the world and enabled countless discoveries. This trivia question focuses on a significant product innovation that changed how scientists conduct research. Do you know when these pivotal scientific products were first developed and commercialized?

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Polymerase Chain Reaction (PCR) technology for DNA amplification
Scanning Electron Microscope (SEM) for high-resolution imaging
Gas Chromatography-Mass Spectrometry (GC-MS) for chemical analysis
Atomic Absorption Spectroscopy (AAS) for elemental detection