Question

How to take a reading on Vernier calipers (pls tell in simple words) ?

Answer 1

Explanation:

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 (E.g. 0.03 cm)



Let’s examine the image of the vernier caliper readings above. We will just use a two steps method to get the measurement reading from this:

To obtain the main scale reading: Look at the image above, 2.1 cm is to the immediate left of the zero on the vernier scale. Hence, the main scale reading is 2.1 cm

To obtain the vernier scale reading: Look at the image above and look closely for an alignment of the scale lines of the main scale and vernier scale. In the image above, the aligned line correspond to 3. Hence, the vernier scale reading is 0.03 cm.

In order to obtain the final measurement reading, we will add the main scale reading and vernier scale reading together. This will give 2.1 cm + 0.03 cm = 2.13 cm.

In a nutshell

Use the following formula:

Obtained reading=Main scale reading+Vernier scale readingObtained reading=Main scale reading+Vernier scale reading

Let’s go through another example to ensure that you understand the above steps:



Main scale reading: 10.0 cm (Immediate left of zero)

Vernier scale reading: 0.02 cm (Alignment of scale lines)

Measurement reading: 10.02 cm

Compensating For Zero Error

Answer 2

Answer:

Explanation:

Follow these steps to read the Vernier calipers:

1. Read the main scale. Look for the last whole increment visible before the 0 (zero) mark.
2. Read the secondary scale (Vernier) measurement. This is the division tick mark that lines up best with a mark on the main scale.
3. Add the two measurements together.