Caliber, what is it and how to choose the best and cheapest?

November 2, 2021

The caliper (which is also called Vernier, meter foot, sliding gauge or vernier caliper) is a tool used for measurements , mainly of internal, external and depth diameters, being used mainly in the industrial field.

The caliber is an auxiliary measure, which is slid on a main scale with the intention of obtaining from them, exact fractional readings with the minimum division. The way to achieve this is thanks to the graduation of the caliber, having an ideal number of divisions to what is required in the main scale; both the main and secondary scales are marked in the same direction.

This instrument is extremely delicate , so it needs to be handled with delicacy and care, avoiding folds and scratches, also ensuring that no filings are found between its pieces, causing damage as well.

Gauge parts

Below you will be able to know each of the parts of the caliber, as well as its functions and characteristics.


This refers to the support or ruler that contains the measurements at the time of using the gauge, that is, it is where we can read and obtain the measurements; being also the support of the rest of the pieces.


This piece slides over the body, having a square and hollow shape in the middle, showing and indicating the measurements that are taken. Care is taken that the piece is loose on the body so that it is easy to move, but still has enough traction to remain fixed on its own.

Outdoor jaws and indoor ears

As their name indicates, they are pieces used to measure outside and inside diameters respectively, being ideal accessories to obtain accuracy in these measurements.

Rod for depth

It allows to measure the depth, giving greater efficiency and ease when obtaining this type of measurements.


Vernier graduation in millimeters, vernier in inches, graduated scale in millimeters and inches. These are all the measurements that the caliber handles, covering the ordinary metric system and English, working with scales from 1 to 10, 1 to 20, among others.

Button or screw to lock the slide

It can be located in the same slide or in the body of the gauge, having as its main puncture that it remains in place without moving while measurements are taken, being pressed or rotated for the movement of the slide.

Gauge types

We can define 6 types of gauge, which offer various functions and great capabilities when used for measurements.

Indoor and outdoor gauge

This type of gauge is used to measure the internal and external size of any object, based on the necessary adjustment that is achieved using its screw. Its use provides a high level of accuracy to the user, being just as efficient with both types of measurement.

Generally, this gauge is made of high-carbon steel.

Divider Gauge

It is very popular and effective in the industrial world, for this very reason, it is highly specialized in the field, offering quality and efficiency when marking exact locations, being totally precise when doing so; in addition to being the most reliable option , technologically speaking.

Digital gauge

For its part, the way this gauge works is simply unique, reflecting its calculations digitally on a clear glass display . Its function is based on an internal legislator, with the ability to detect any type of displacement.

Although it is the most expensive option on the list, it can streamline any job, making it simple, offering effortless effectiveness. It should be noted that this gauge is very delicate, so it must be handled carefully and delicately.

Scale gauge

Although it used to be known as a vernier, this caliber is the most faithful to its origins, being the one that covers the most fields, such as science, navigation, industry and engineering. When using it, the three basic measurements it offers (interior, exterior and depth) can be made, using its own scale to give results.

In the first place, the result of the fixed scale must be read to proceed to find the result of the secondary scale, achieving effective results, with an accuracy of up to two decimal places.

It is very important to note that this gauge allows you to determine when measurements are made correctly, based on the straightness of the lines and their alignment.

Height gauge

For its part, the body of this caliber usually has a graduation of millimeters or centimeters, being used mostly to achieve the tracing of fragments .

Carbide gauge

Its focus is that it is used on objects with rough surfaces and difficult to work with, being known especially for this ability.

Its name comes from the tip of said gauge, which is made of the same carbide mentioned, increasing its resistance and firmness against abrasion .

Gauge benefits

As mentioned, it is a tool with various functionalities and benefits, among which we can name:

  • Various industrial applications for different purposes, be it for engineering, navigation or science, you can fulfill your mission in the best way.
  • It is considered to have the best accuracy on the market, providing results of up to two completely correct decimal places (something that other similar tools cannot do).
  • It can be easily transported, being light and easy to hold or store; you simply have to be careful with it, since as we mentioned before, its materials are somewhat fragile.
  • It is the ideal tool to obtain dimensions, this because it was ideally designed for such a task, creating its own scale to obtain incredibly accurate results.
  • They have evolved since its inception, currently offering various methods for the comfort of each user, covering everything necessary to make using it simple and without problems.
  • Even being a product of delicate handling, it does not require rigorous maintenance beyond cleaning certain residues that may be trapped between its parts.

The caliper is an excellent tool, it has everything necessary to provide the most accurate results than any other measuring instrument in this field, being simple to use once the scales with which it works have been known.

Dr. Loony Davis5
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Born and raised in Brussels in an English family, I have always lived in a multicultural environment. After several work experiences in marketing and communication, I came to Smart Water Magazine, which I describe as the most exciting challenge of my career.
I am a person with great restlessness and curiosity to learn, discover what I do not know, as well as reinvent myself daily, someone who is curious about life and wants to know. I enjoy sharing knowledge.
This is my personal project but I also collaborate in other blogs, it is the case, the most important web on water currently exists in the US, if you are interested you can read my articles here.

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