To reduce the disc weight

For power factor correction

To prevent the flux leakage

To arrest the creeping error

Makes the needle movement faster

Helps the deflecting force to act fast

Brings the needle to its zero position

Arrests the needle without oscillations

Strengthens the deflection force

Controls the needle's movement

Provides meter with maximum sensitivity

Provide uniform distribution of magnetic flux in air gap

Low accuracy

High sensitivity

Low sensitivity

Low influence error

Tachometer

Energy meter

Ampere hour meter

Centre zero ammeter