Tachometer

Energy meter

Ampere hour meter

Centre zero ammeter

No terminal marking

Terminal marked (+) only

One terminal coloured red

Terminal marked (+) and (-)

Ammeter

Volt meter

Energy meter

Tangent galvanometer

Damping force

Deflecting force

Repulsion force

Controlling force

Displays the quantity

Indicates the quantity

Registers the quantity

Measures the quantity