Measurement and Instrumentation
Resolution of an instrument is

 the minimum quantity it can measure.
 the maximum quantity it can measure.
 the maximum non linearity.
 ability to distinguish polarity.

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Measurement and Instrumentation
In DC potentiometer measurments, a second reading is often taken after reversing the polarities of the DC supply and the unknown voltage and the average of the two reading is taken. This is with a view of eliminate the effects of

 Stray magnetic fields.
 Ripples of the DC supply.
 Errorneous standardisation.
  Stray thermal emfs.

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