The LX-100 series of digital color mark sensors utilizes 3 LED elements (Red, Green, and Blue) offering high precision sensing of any color marking. A four digit digital display allows for user-friendly setting and monitoring of sensor settings. Six easy-to-see indicators surround the main display allowing quick and easy confirmation of the operating mode. Also, the threshold value can be conveniently checked at the touch of a button. One-level, two-level and fully automatic teaching methods are available with an option of external teaching if the sensor is not easily accessible. The LX-100 series has two detection modes.