Spring control

Air damping control

Magnetic repulsion control

Magnetic attraction control

Steel frame

Wooden frame

Ceramic frame

Aluminium frame

Control the pivot point

Control the jewel bearing

Control the magnetic field

Control the swinging of the coil

To generate heat

To damp the oscillations

To achieve uniformity of scale

To produce magnetic attraction

FSD current

Meter coil resistance

Ohms per volt rating

Maximum voltage measurement