PA-II sensors give different results

I have a PA-II installe outdoors. Recently I have observed that the two sensors are giving results that differ by as much as a factor of two. Does the PA-II need to be replaced? Can you replace the sensors?

Hi @bbjorndal, I recommend viewing our Sensor Maintenance article for the next steps. You can try cleaning out your sensor. You are also able to replace the laser counters inside.