Measurement and Instrumentation
A DC potentiometer is the best means available for the measurement of DC voltage because

 The precision in measurment is independent of the type of the defector used.
 It is possible to standardize before a measurement is undertaken.
 None of above.
  It is based on null balance technique.

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Measurement and Instrumentation
Potentiometer method of DC voltage measurement is more accurate than direct measurement using a voltmeter because

 It uses centre zero galvanometer instead of voltmeter.
 It loads the circuit to maximum extent.
 It loads the circuit moderately.
  It does not load the circuit at all.

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