Question

How parallax error can be prevented during measurement?

Answer 1

Orient your line of sight directly above the measurement marking on a ruler or similar device so that an imaginary vertical line connects your eye, the marking and the object. ... Read the lower part of the curved surface of the liquid -- the meniscus -- to gain an accurate measurement and avoid parallax errors.

Answer 2

Orient your line of sight directly above the measurement marking on a ruler or similar device so that an imaginary vertical line connects your eye, the marking and the object. ... Read the lower part of the curved surface of the liquid -- the meniscus -- to gain an accurate measurement and avoid parallax errors.

I hope you are understand my solution