Amazon.com : Seco-Larm E-931-S50RRLQ Large 50-Feet Infrared Reflective Photoelectric Beam Sensor, 12V to 250V AC/VDC, Adjustable 50 to 700 ms Reaction Time, IP55 Enclosure : Electronics
Amazon.com: Reflector de cubos de esquina negro/plata, acrílico, de Telemecanique SENSORS : Industrial y Científico
Amazon.com: 3.4“ Round German Reflector | Silver Mirror | Flat | Plastic | for USE with POLORIZED Super Retro-Reflective |PHOTOELECTRIC SENSORS | Photo Beam Sensor | Very HIGH LUMINANCE Factor 6000 X : Industrial & Scientific