Question

in using a vernier scale reading to measure an object, the main scale reading was read to be 0.7cm and vernier scale reading to be 3cm. find the actual measurement of the object

Answer 1

The main scale reading (yellow) is to the left of zero on Vernier scale. It is 0.7 cm. The vernier scale is in the bottom and its reading (blue) is 3 cm:

This means that the actual measurement of an object is

$$m=0.7+3/10=0.73\text{ cm}.$$