Measurement and Instrumentation
The spring material used in a spring control device should have the following property.

Should non magnetic
Most be of low temperature co-efficient
Should have low specific resistance
All of the listed here

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

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

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