## Introduction to Vernier Scales

**Vernier Calipers.**
An instrument which is commonly encountered in the laboratory is the vernier caliper. The vernier caliper shown on this page has twenty divisions on its vernier scale allowing measuements to be taken to the nearest twentieth of a mm.
So for this vernier caliper if first tick (after the zero tick) is aligned the vernier reading is 0.05 mm, if the second tick is aligned 0.10 mm, etc. .

To show the lines accurately the image is large. You may need to use the scrollbars to look at different parts of the image.

Reading from the main scale 2.0 cm,

reading from the vernier 0.05 mm,

so the length to the nearest twentieth of a mm is

2.0 cm + 0.05 mm = 20 mm + 0.05 mm = 20.05 mm

Reading from the main scale 1.2 cm,

reading from the vernier 0.40 mm,

so the length to the nearest twentieth of a mm is

1.2 cm + 0.40 mm = 1.2 cm + 0.040 cm = 1.240 cm

Reading from the main scale 0.0 cm,

reading from the vernier 0.75 mm,

so the length to the nearest twentieth of a mm is

0.0 cm + 0.75 mm = 0 mm + 0.75 mm = 0.75 mm

This is currently the end of Introduction to Vernier Scales but examples of the travelling microscope, micrometer and torsion balance will be added shortly.

Go to
Why use vernier scales?
How vernier scales work.
Worked examples.
Vernier Calipers.

Go up to Online Exercises.