Diffraction grating is better than two slits set up for measuring the wavelength of a monochromatic light. Explain

Diffraction grating is better than two slits set up  for measuring the wavelength of a monochromatic light. Explain. 
Ans: In diffraction grating, the spectrum of the light obtained is very sharp and clear than that of two slit. This helps for precise measurement of wavelength of the monochromatic light.  So, diffraction grating is better than two slits set up for measuring the wavelength of monochromatic light.