#18: Geiger Counter (20th century widespread use)
The Geiger Counter made invisible radiation detectable. It measures ionizing radiation levels in various environments. This capability became crucial in nuclear science and safety. The device helped monitor radiation exposure in medicine and industry. It also played a role in environmental protection. The Geiger counter turned a hidden danger into measurable data. Its clicking sound became synonymous with detection. It allowed scientists to study radioactive materials safely. Its importance remains significant in modern applications.
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