How to take readings in vernier calliper?
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Although the vernier caliper can be used to measure a variety of different dimensions, the way in which it is read is always the same.
The reading on a vernier caliper is a combination of the value shown on the main scale and the value indicated on the sliding vernier scale.

Step 1 - Look at main scale
When taking a measurement, you should first read the value on the main scale. On a metric vernier caliper, this will be given in millimetres (mm).
The smallest value that can read from the main scale is 1mm (indicated by a single increment).

The value on the main scale is the number immediately to the left of the 0 marker of the vernier scale.
In this instance, this value is 27mm.
As the zero is almost touching the 28mm mark, we can estimate that the distance between the jaws is closer to 28mm than 27mm.

Step 2 - Look at vernier scale
Next, look at the vernier scale. The vernier scale of an metric vernier caliper has a measuring range of 1 mm. In the example we will be looking at, the vernier scale is graduated in 50 increments.
Each increment represents 0.02mm. However, some vernier scales are graduated in 20 increments, with each one representing 0.05mm.

When reading the vernier scale, identify the increment that lines up most accurately with an increment on the main scale. This value will make up the second part of your measurement.
In the example, the increments of both scales coincide at the 0.8mm on the vernier scale.

Step 3 - Add both values together
To get your total reading, add both the value from the main scale and the value from the vernier scale together.
e.g. 27 + 0.8 = 27.8
So, the distance between the jaws of the vernier caliper is 27.8mm.
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The main scale contributes the main number(s) and one decimal place to the reading (E.g. 2.1 cm, whereby 2 is the main number and 0.1 is the one decimal place number)
The vernier scale contributes the second decimal place to the reading.
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