What is a dial caliper?
A Dial caliper is a calibrated precision measuring tool that is useful for taking accurate measurements.
Dial calipers are much more common nowadays than vernier calipers.
The central feature, the dial indicator, makes dial calipers much easier to use and read.
The reading given on the dial indicator is combined with the value shown on the main beam scale.
Dial calipers use a rack and pinion mechanism system, which transfers the movement of the jaws of the caliper to the dial indicator.
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.
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.
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.
Most dial calipers are able to take four different kinds of measurement: outside measurements, inside measurements, depth measurements and step measurements.
This capability is sometimes referred to as quadri feature.