Proximity Sensor, Photoelectric Sensor, Vehicle Loop Detector manufacturer / supplier in China, offering Manufacturer Miniature 4m PNP NPN Retro Reflective Optical Sensor Photoelectric Switch with CE, PF21r 4m Distance NPN Transistor Output Retro-Reflective Optical Sensor for Industrial Automation, 4m Detection Range Photoelectric Sensor with Visible Laser-Like Light Spot and so on.