Jisho

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けんでんき 検電器
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Noun
1. voltage detector; voltage tester; electroscope​
Wikipedia definition
2. Electroscope​An electroscope is an early scientific instrument that is used to detect the presence and magnitude of electric charge on a body. It was the first electrical measuring instrument. The first electroscope, a pivoted needle called the versorium, was invented by British physician William Gilbert around 1600. The pith-ball electroscope and the gold-leaf electroscope are two classical types of electroscope that are still used in physics education to demonstrate the principles of electrostatics.
Read “Electroscope” on English Wikipedia
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