I have scavenged some photo interrupters from multiple printers but I am trying to figure out the polarity and the voltage. I've tried searching up photo interrupter polarity but couldn't find anything. On one of side of a sensor, it is labelled: A and K and on the other side it says E and C. It also says on the sensor H306-41. All the other sensors are unlabelled. Is there an easy way to find the polarity and voltage with a meter?
Edit: Images: Picture of labelled sensor:
Picture of unlabelled sensor: