METROL switches are used for the application that requires high accuracy such as position detection and dimension discrimination.
Most widely used limit switches, micro switches, proximity sensors, and photoelectric sensors are called " existence detection sensor" to tell you that the objects are there or not, passing through or not.

And they are also used for counting objects.

On the other hand, METROL precision switches are called " position detection sensor" that can detect not only existence but also exact position and dimension of the objects.