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In which of the following ways can zero drift be reduced in pH meters?

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In which of the following ways can zero drift be reduced in pH meters?

(a) Using filter

(b) Giving zero adjustment arrangement

(c) Keeping the input impedance high

(d) Using balanced and differential amplifiers

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Enquiry is from pH Meters topic in portion pH Meters and Ion Analysers of Analytical Instrumentation

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Correct option is (d) Using balanced and differential amplifiers

Explanation: Zero drift be reduced in pH meters using balanced and differential amplifiers. Their response to external signals are additive and to internal noise are subtractive.

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