What is a dial caliper?

 
 
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 A Dial caliper is a calibrated precision measuring tool that is useful for taking accurate measurements.  

A Dial caliper is a calibrated precision measuring tool that is useful for taking accurate measurements. 

 
     
Wonkee Donkee says: 'What does calibrated mean? If an instrument is calibrated, the readings it provides are correlated with those of a standard so they are extremely accurate.'
     
 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.  

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. 

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. 

Dial calipers use a rack and pinion mechanism system, which transfers the movement of the jaws of the caliper to the dial indicator.

 
     
   

Measuring range

 
 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 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.

 
     
   

Graduation

 
 The graduation of a 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 or 0.001 inches. Graduation is normally indicated on the face of the dial. 

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.

 
     
   

Quadri feature

 
 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. 

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.

 
     
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