Vernier Caliper’s Guidelines for Usage & Appropriate Measurements

Vernier Calipers are very important instruments that are used in various fields, and are used in academic purposes as well. Beginners in academia as well as in industries need guidelines about standard practices to use Vernier Calipers with suitable measurements.  

How to Use Vernier Caliper:

In order to use Vernier Caliper, we need to place Vernier Caliper correctly on the edges of object to obtain the measurement that is required. For instance while measuring the thickness or size of an object we need to make sure to put Vernier Caliper on the object with correct angles to acquire exact measurement. To measure oblique shaped or circled shaped objects. Little practice might be required to get error free results. Some recommendations are discussed below:

  1. Measurement with precision while utilizing Vernier caliper is totally reliant on the ability and proficiency of the one who is using it. Irrespective of type the jaws of the Vernier calipers must be properly fixed on the edges of the dimension of object which is being measured.
  2. Vernier caliper must not be utilized with extra amount of force and must be placed correctly on both edges to get accurate results. By applying excessive force there is a chance that you will get misreading due to deformation of material either of the object or Vernier Caliper.
  3. With application of minimal force there won’t be suitable clamp with the measuring object and results can be misleading.
  4. Vernier Caliper should not be used obliquely on the edges of any particular dimension of object. The jaws should be perfectly perpendicular to give accurate readings.
  5. Simple and digital calipers are somehow different and user must take extra care and be attendant while using analog caliper. As analog calipers, vernier or dial must be seen cautiously with zero vision error while digital calipers possess quite an ease in this areas as reading can be seen normally on the little screen without any difficulty.

The sliding scale of vernier has 10 indication marks. The most left indication mark on the sliding scale as depicted in the picture, enable user to read from the main scale the number of whole millimeters that the jaws are opened. 

General scales & Concept of Least Count:

Nearly all general measuring equipment possesses a basic scale. For instance, the scale is positioned beneath the object being measured and the scale is placed edge to edge of the object. If enhanced precision is required, a scale with more divisions on the ruler is opted, with higher least count. This is depicted in Figure 1.

Figure 1

How to Measure:

This is called Vernier Caliper because of utilization of a Vernier scale. This caliper has tendency to determine the outer thickness of an item (outer vernier), the inner diameter of an opening (inner caliper), or the deepness of a gap (distance downward probe) and the steps of an abject. Figure 2 depicts direction on the utilization of the Vernier caliper. One jaw of the caliper is permanent, and the other jaw shifts and is linked to the Vernier.  

  • Make sure that the vernier caliper properly confirms zero readings when the jaws are at Zero point.
  • Mantle the jaws fixed on the dimensional edges to be measured of an item. Make sure that it is not over tightened. The jaws must put forth a gentle force on the edges of dimension of item to be measured.
  • When both jaws are fixed on the objected dimension, lock screws are fastened so as to fix the jaws of the caliper & now it can be removed from the edges of that item. Reading can be taken without the worry of the jaws being shifted or moved.
  • You can interpret the main scale reading in the millimeters. Moreover the division of Main scale before or exactly on the first division of Vernier scale defines the main scale reading.
  • The division of the Vernier scale exactly coinciding with the main scale division gives the Vernier scale reading whose fractional part is added with the main scale reading to give the final reading.


vernier calipers various parts
Complete Vernier Calipers (Figure 2)

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