Leuze electronic prkl 25b laser retroreflective photoelectric sensor pol filt leuze electronic 50104231 a polarised retroreflective photoelectric sensor that has a visible red laser light giving the sensor the ability to reliably detect small parts and objects even at long ranges the optimum light beam propagation with its tightly focused light beam is ideal for positioning and counting applications the near 15m operating range is adjustable via a potentiometer on the sensor body addit