It is obviously true that precise measurements of physical quantities are crucial for scientific advancement. The following are examples of modem science, where precise measurements play an important role:
1) The electron microscope uses a wavelength 0.2 A^{^0} electron beam to examine very minute structures such as bacteria, microbes and solid crystal.
2) We must calculate time to a precision of 1 micro second during the launch of a satellite using a space launch system rocket system.
3) We need an accuracy of 10-^{-15} m to estimate nuclear sizes. We should have an accuracy of 10-^{-30} kg and so on in measuring atomic masses using mass spectrographs.
4) The precise measurement of distances in the Michelson-Morley Interferometer helped to reject the concept of hypothetical medium ether and to develop Einstein's theory of relativity.
5) Ultra-shot laser pulses are used to calculate time intervals ( 14^{-15} seconds) in a variety of physical and chemical processes.