Best 9 Measuring Instrument for Mechanical sector

In this article 9 essential Measuring instruments for mechanical engineers. Every Mechanical Engineering student and mechanical employee should learn about this. This equipment is very important for perfect measurement. So This equipment is used in industries and the mechanical sector. Before discussing measuring instruments first know what are Metrology and Mechanical measurements?

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Metrology is a part of science.  It deals with the study of measurement, measuring instruments, and checking.

 Mechanical Measurements:

Measuring Instrument

Measurement is a process where we calculate the unknown quantity to known quantity. There are some instruments are used to measure. These instruments are called measuring instruments. Measurement is performed to know the component accurate or not as per need. We measure length, time, mass, angle, temperature, roundness and roughness. There are some units to measure any quantity.

 The measuring appliances of mechanical engineering are dimensional control instruments. It is used to measure the exact size of an object. These are adjustable. It can measure with perfect accuracy.

Types of Measurement:

It is divided into 4 types

  • Liner Measurement:

In linear measurement, we measure length, breaths, height, and depth.

  • Angular Measurement:

when two lines intersect each other then it creates an angle. Some types of angle measurement instruments are Drafter and Protector.

  • Geometrical dimensioning and Tolerancing.
  • Surface roughness Measurement.

Some types of Measuring Instruments:

There are different types of measuring instruments are used in Mechanical Engineering. They are

  • Vernier Caliper
  • Micrometer
  • Steel Scale
  • Vernier Height Gauge
  • Bevel Protractor
  • Dial Gauge
  • Radius Gauge
  • Feeler gauge
  • Snap gauge


Measuring Instrument

Vernier Caliper is mostly used to measure linear measurement. It is a linear measuring instrument. Its least count is 0.02 mm. It is mainly used to measure linear dimensions. It measures length, diameter, and depth. It is a basic Instrument of measurement. It consists of two categories of scale. The main scale and the Vernier scale. It can slide along the main scale. We can do two types of measurement in a vernier. The first one is the external jaw. Through the external jaw, we measure external dimensions. Another one is the internal jaw. Through the internal jaw, we measure internal dimensions.


Measuring Instrument

There are so many types of micrometers here. The external Micrometer is also called an Outside Micrometer. It is also known as an external micrometer. It is utilized to check the outside diameter of a circle. The accuracy of the micrometer is 0.01 mm to 0.001 mm. The vernier type Micrometer gives outstanding acceptable accuracy of 1 micron.


Measuring Instrument

The steel scale is a single-piece linear measuring instrument. The steel scale suggests two units. These are cm and inches. One side is Cm division and inches on another side.


Measuring Instrument
Image Credit – Photograph taken by Glenn McKechnie

The vernier height gauge is used to measure vertical dimension from the ground. The vernier Height Gauge consists of a graduated scale. It is held in a vertical position to the ground fixed base.

The least count of verifier height gauges is  0.02 mm. The least count is the same as the vernier caliper. The way of carrying a reading of measurement in Vernier Height Gauge is the same as in Vernier caliper.


The bevel protractor is a basic instrument of the measurement process. It is used for measuring angles. Its least count of 1° or ½°. By using a bevel protector we can measure the angular surface. Bevel protractor is eligible to measure angles. It’s least count is 5’.

The protractor dial is succeeded in degrees with every tenth degree numbered. The sliding blade is equipped into this dial. It may be extended to the direction. It establishes an angle to the base.


Measuring Instrument
Image Credit – Solaris2006

The dial gauge is a simple measuring instrument. It is widely used in every mechanical sector. At first, the dial gauge is used to compare work-pieces against a master. Lever Dial Gauge is also known as Test Indicator. The test indicator is used to measure sensitive contact. Test indicators measure up to 0.80 mm. There is some special type of level dial gauge here. Here we measure up to 2 mm.


Measuring Instrument
Image Credit – Graibeard at English Wikipedia.

Gauges are developed from the French word” gauge”. It means the result of the measurement. We use these gauges to measure the thickness, size, and capacity of something. Radius gauges are instruments are used to measure the radius of the object. The radius gauge is stirred with another gauge known as fillet gauge.


Measuring Instrument
Image Credit – Qurren

The Feeler gauge is mostly used to measure the clearance. The measure is between two parallel flat faces. A feeler gauge is also called a packing gauge.  It is a piece of equipment where we measure narrow gap widths between two surfaces. The feeler gauge is accessible in the number of the blade up to 0.05mm to 3 mm.


Measuring Instrument
Image Credit – Tom8442

The snap gauge is mostly used in the automobile sector. The snap gauge has two measuring processes. These are go and NOGO type. It means snap gauge consists of 2 fixed measured distances or gaps. One is learned as GO and another one is learned as NOGO.

Difference between Micrometer and Vernier caliper :


  • It is more accurate than the verifier caliper.
  • The micrometer measurement range is 25 mm.
  • In the case of a micrometer, you have to use a depth micrometer to measure depth.
  • Inside micrometer is used to measurement of inner diameter.

Vernier Caliper:

  • It is low accurate than a micrometer.
  • Vernier caliper measurement range has a wide range.
  • You can check depth by verifier caliper.
  • In this case of the vernier caliper, it is checked by the internal jaws.


Here I explain 9 Measuring instruments for mechanical engineers. It is useful for every Mechanical Engineering student or employee. Nowadays measuring instruments use in every mechanical sector for proper or perfect work.

Thank you

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