Thru Beam Sensors provided by us, are used to detect and count small pieces. These sensors also detect the edges of objects and monitor passages in systems. According to the through-beam mode, the emitter and receiver are housed in separate housings. When an object blocks the laser, red light, or infrared light, the sensor activates. Thru Beam Sensors are used in conjunction with a reflector. Both the light source and the receiving equipment are housed together in retroreflective sensing. They are very effective and safe to use.