The E3S-CT11 2M is an Omron fiber-optic sensor that is used for detection and measurement of objects. It works by focusing an infrared light source on the surface of the object to be measured, and then measuring the reflection of the light off the surface. The output signal indicates the size, shape, color, and other characteristics of the object. The sensor has a two-meter sensing range, and is capable of detecting objects up to two meters away. The E3S-CT11 2M is designed for industrial and commercial applications, and is suitable for use in environments with high temperatures, dust, and other contaminants.