In edge polishing machines it is necessary to detect the presence of marble or granite slabs. UK6 ultrasonic sensors identify objects regardless of the brightness and color of the material, even in the presence of dust. Unlike other technologies, ultrasonic technology is the ideal solution for detecting objects of different colors and shades, such as marble and granite slabs. In addition, ultrasonic sensors operate correctly in dusty applications where photoelectric technology would struggle due to darkening of the optics.