|It can be used for a.c as well as d.c voltage and current measurement.
||It is suitable only for the d.c voltage and current measurement.
|Less sensitive as compared to MC instruments.
||It is much sensitive than M.I instruments.
|Torque to weight ratio is less as compared to M.C type.
||Torque to weight ratio is high as compared to M.I type.
|It is cheaper then MC and dynamometer.
||It is costlier then M.I and dynamometer type due to high cost of permanent magnets.
|Air friction damping is used.
||Damping is perfect as eddy current damping is used.
|Error are set due to hysteresis and stray fields.
||Error are set due to aging of control springs,permanent magnet.