1. Close the jaws of the vernier calipers. Ensure that the zero marking on the vernier scale is in line with the zero marking on the main scale.2. Place the object within the jaws of the vernier calipers and clamp it firmly in place.
3. Read the length.
Inside jaws: Used to measure the internal diameter of an object.
Outside jaws: Used to measure the external diameter or width of an object.
Tail: Used to measure the depth of an object/hole.
Main scale reading: The main scale gives measurements of up to one decimal place.
Vernier scale reading: The vernier scale gives measurements of up to two decimal places.
go to http://www.physics.smu.edu/~scalise/apparatus/caliper/tutorial/simulation.html to try the vernier caliper simulation!
Source: Lower Secondary Science Matters
published by Marshall Cavendish Education
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