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
All of the listed here
Should have low specific resistance

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Measurement and Instrumentation
The measurment of very low and very high frequencies is invariably done using a frequency counter in which one of the following?

 Frequency and period measurment modes, respectively.
 Frequency measurment modes only.
 Period measurment modes only.
  Period and frequency measurement modes respectively.

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