Which microscope is often used to view metal surfaces

The question is which microscope is often use to view metal. The answer is scanning tunneling microscope. It is a high resolution microscope which uses neither light nor electron beam but it has very fine tip which has the ability to reveal the atomic and molecular details of metals. It was developed in 1981 by Gerd Binnig and Heinrich Rohrer.

Generally travels west to east but often shifts to north and south