Contrinex manufactures five models of ultrasonic sensors with diverse operating principles. It starts with diffuse and reflex sensors, with their cubic 40 mm x 40 mm housing size and 0 to 200 mm sensing range. Next, the diffuse sensor is M18 size with a range from 0 to 700 mm, while the diffuse sensor with background is M18C size with a range from 100 to 700 mm. In housing size M18W is the reflex sensor, which offers a range of 150 to 1,000 mm, and in size M30 is the through-beam sensor, for sensing objects within a 200 to 1,300 mm range.