Discussion
Which laboratory instrument for measuring the acidity or alkalinity of a liquid was invented by its designer in the 1930s?
Answer: D
It is the pH meter, invented by Arnold Beckman.
He built it in 1934 for a Californian citrus grower who needed to measure the acidity of lemon juice, using a vacuum-tube amplifier to read the tiny voltage from a glass electrode. It founded Beckman Instruments.
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