know here all things of PH Meter was invented by which scientist | Arnold O. Beckman discovered what ?
question : Electricity was invented or discovered by whom ?
answer : The famous scientist named Arnold O. Beckman was the inventor of PH Meter in the year of 1934.
question : Arnold O. Beckman invented which thing and when ?
answer : In ‘1934’ year the well known scientist whose name is ‘ Arnold O. Beckman ‘ was the inventor of PH Meter.
question : when and by whom PH Meter was discovered ?
answer : PH Meter was the discovery of Arnold O. Beckman which was discovered in 1934 year.
so in short we can say –
invention : PH Meter
inventor : Arnold O. Beckman
year : 1934
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