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How does the scale of a metric
dial caliper work?

Shop for Dial Calipers
Metric dial indicators are usually accurate to 0.02mm, with one revolution of the needle indicator representing 2mm. Most calipers provide the reader with measurements in either millimetres (metric) or inches (imperial). Metric dial indicators are usually accurate to 0.02mm, with one revolution of the needle indicator representing 2mm.
The main scale of a metric dial caliper is typically 150mm long and is divided into centimetres and millimetres. The main scale of a metric dial caliper is typically 150mm long and is divided into centimetres and millimetres.
 Wonkee Donkee says: 'There are dial calipers that measure in both metric and imperial units. However, these can be difficult to find and tend to be more expensive that standard dial calipers.'