Most common application of the multi-peak interferometers in industry is the one-sided multi-layer thickness measurement of thin layers, flat glass and films. They are used in the production of coated glass, batteries, plastic film, displays, LED and similar.
Also distance measurements are possible on many surfaces, e.g., glass, metals, films/coatings, lenses, and other. Systems for multi-peak distance measurement are therefore used in high-tech industries, like semiconductor and miniature microelectronic industry.
For their high resolution and linearity MP interferometers are often used in laboratories.