Question

What is the difference between Vernier caliper and screw gauge?

Answer 1

We will answer this question by knowing what Vernier caliper and screw gauge are. Further we will tell its uses and then make a comparison between Vernier caliper and screw gauge to tell about their differences.

Complete answer:
We have various kinds and shapes of 3d objects around us and we need to measure their diameters, thickness, depth etc. but these all measurements cannot be made only by scale, hence we have various other means of measurement called Vernier calipers and screw gauge.

Vernier caliper: It is a measuring device which has a main scale and a fixed jaw with an attached Vernier.
Screw gauge: It is a measuring device mainly used to measure the diameter of thin wires, sheets, etc.
Let's look at the differences:

Vernier caliper	Screw gauge
It’s least count is 0.01mm	Least count of screw gauge is 0.001mm
It is used to measure internal measurements like depth, etc of an object	It can be used to measure only thickness of sheets externally
It has 2 scales main scale and Vernier scale	It has a circular scale and a main scale
It is less precise compared to screw gauge	It is more precise
It is comparatively less accurate	It is more accurate

Note: While using Vernier calipers make sure the jaws completely touch the object to be measured. Check for zero error before using any instrument. Accuracy and precision are two different concepts that do not confuse them to be the same.