Generally, it can be divided into two types: in-situ measurement and off-site measurement. 

It is widely used in physical vapor deposition, such as microbalance, optical measurement and resistance measurement. 

The off-position measurement means that after the film is finished, the exercise of the electroplating film is more common, 

and has the purpose of understanding the electroplating efficiency, such as quality, profile meter, 

scanning electron microscope.