Dial Type Vernier Caliper

Dial Type Vernier Caliper

The measuring range of a caliper is the difference between the largest value and the smallest value that it can measure.

The measuring range of most dial calipers is 150mm (6 inches), although calipers with ranges of between 100mm (4 inches) and 300mm (12 inches) are also available.
The graduation of a dial caliper is the smallest distance it can measure; the value of a minor increment on the dial scale.
The graduation of most dial calipers is 0.02mm for metric versions, and 0.001 inches for imperial dial calipers.
Graduation is normally indicated on the face of the dial.
When selecting a caliper, bear in mind the approximate size of the object you are measuring.
To measure larger objects, you will need a caliper with a larger measuring range.