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

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

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Measurement and Instrumentation
The measurement of a quantity

 is a comparison of an unknown quantity with another quantity.
 is a comparison of an unknown quantity with known quantity.
 none of these.
  is a comparison of an unknown quantity with standard.

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