Baumer O500.GR-NV1T.72CU/T003 Diffuse Sensor, Background Suppression, 10-30VDC, 60-550mm Sensing Distance Tw, 30-600mm Sensing Range Tb, Pulsed Red LED, 630 nm, NPN, qTeach/1-Step Teach-In, Light/Dark Operate, 2m 4-Pin Cable, Plastic Housing, PMMA Optics, 45 x 18 x 32mm $209.00 Select