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How does the scale of an imperial
dial caliper work?

Shop for Dial Calipers
Imperial dial indicators are accurate to 0.001 inches, with one revolution of the needle indicator being equal to 0.1 inches. Most calipers provide the reader with measurements in either millimetres (metric) or inches (imperial). Imperial dial indicators are accurate to 0.001 inches, with one revolution of the needle indicator being equal to 0.1 inches.
The measuring range on the beam scale is usually 6 inches, graduated in 0.1 inch increments. The measuring range on the beam scale is usually 6 inches, graduated in 0.1 inch increments.
  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 than standard dial calipers.'