# Compare primary and secondary instruments.

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Compare primary and secondary instruments.

 Primary instruments Secondary instruments Gives magnitude of quantity in terms of physical constants of instrument Gives reading directly of the quantity measured. Need no calibration Calibrated with respect to absolute instruments Measurement is tedious and time consuming (as indirect) due to calculations needed to be done Quick method as direct method of reading. Very rarely used. Very widely used. e.g. tangent galvanometer and current balance galvanometer. e.g. magnetic meter, induction meter, hotwire meter and electrostatic meter

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