Which scientific instrument was accidentally invented in 1945 when Percy Spencer noticed a chocolate bar melting in his pocket while working with a magnetron?

In scientific research and development, breakthrough products often come from years of innovation and sometimes unexpected discoveries. This trivia question explores a famous scientific product that revolutionized laboratory research. Test your knowledge about the development of tools that scientists rely on daily!

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Microwave oven
Electron microscope
Mass spectrometer
Geiger counter