- Vernier caliper is a measuring tool used to measure length.
- It is more accurate than metre rule. It can measure length with an accuracy up to 0.01cm.
- Figure above shows the illustration of a vernier caliper. For SPM students, you need to remember the name aof the parts and the function of the 2 jaws and the stem.

### Taking Reading from a Vernier Calipers:

- A vernier caliper has 2 scale, namely the main scale and the vernier scale.
- The main scale is read at the zero mark of the Vernier scale.
- The vernier scale is read at the point where it's scale coincide with the main scale.
- Reading of Vernier caliper = Reading of main scale + reading of vernier scale.
- The vernier scale is 9mm long, divided into 10 divisions.

**Example**:

__2.2cm__

Reading of vernier scale =

__0.07cm__

Reading of the vernier caliper =

__2.27cm__

### Zero Error of Vernier Caliper

- The zero error is determined by tightening the jaws of the vernier calipers.
- Zero error must be eliminated from the reading.

Actual Reading = Reading of Vernier Caliper - Zero Error

**Example**:

Images below show the reading of 3 vernier calipers when their jaws are tightly closed. Find the zero error of each caliper.

a.

Zero error =

__0.02 cm__

b.

Zero error = -0.06cm

c.

Zero error = 0 cm (No zero error)

### Exercise

Download the PDF version### Recommended Videos

#### All About Verniers

External Link

Uni. Cape Town: Vernier Calliper

Interactive Animation

NTNU: Vernier Caliper (Java Applet)

SHAW : Vernier Caliper (Java Applet)

Uni. Cape Town: Vernier Calliper

Interactive Animation

NTNU: Vernier Caliper (Java Applet)

SHAW : Vernier Caliper (Java Applet)