# Chapter-2 Vernier Depth Gauge and Depth Micrometer

## 01.Vernier Depth Gauge

Vernier Depth Gauge as the name suggests is used to measure the depth from the surface of reference of an object. Vernier caliper also has depth bar but this can not be used as the standard measurement.

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## Types of Vernier Depth Gauge

There are two type of Vernier depth gauge-

1. Analog type
2. Digital type

The least count of analog vernier depth gauge is 0.02 mm while least count of digital type depth gauge is 0.01 mm

## How to measure depth with Vernier Depth gauge?

The way of taking measurement of vernier depth gauge is same as vernier caliper has. Vernier scale is moveable on main scale.

In case of digital type vernier depth gauge result can see in liquid crystal display with a maximum measuring speed of 1.5 m/s.

The measurement procedure of Vernier Depth Gauge is follow

First we have to find out what is least count of vernier depth gauge, in this case we have least count of 0.10 mm

The way of taking measurement is same as vernier caliper, just follow this steps-

1. Take the value of the Main scale before zero of vernier scale i.e. 21 mm in this case
2. Observe alignment between two scales i.e. 0.40 mm
3. Sum this both value, that is our final value i.e. 21.40 mm

## 2. Depth Micrometer

We also measure depth through Vernier caliper, but Vernier caliper does not deliver as much as accuracy and precision, because extension rod of Vernier caliper has no standard, it used only for comparison purpose.

Depth micrometer used to measure the depth of an object with precision and accuracy with least count of 0.01 mm. The measuring span is 25 mm just like in micrometer, that can change by changing upsetting rod.

## How to Measure with Micrometer?

Measuring Concept of Depth Micrometer is same as External Micrometer. The main differences are direction and position. Reading scale is Vertical in-depth micrometer and Direction of reading is opposite (starting from the end scale).

## Specification

Some normal characteristics of Depth Micrometer describe follows

Accuracy

The accuracy of Depth Gauge is 0.01 mm which is fair enough for linear measurement and also accurate than vernier caliper. You can choose Digital Depth Micrometer, in order to simplify observation only. Both types of Depth Micrometer delivers the same accuracy.

Standard

Depth Micrometer follows national or international measurement standard, while vernier caliper is not(in order to check depth through extension rod only).

The main use of depth micrometer is to check the depth of any objects. Basically used in industrial areas of manufacturing plants.

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