I have a Metrolux II that has a probe much like the zone 6. If I could find the instructions I would copy them and email them to you. Essentially it is lay the probe near the work to be exposed and turn on the timer. I wish I could be more specific but that is all that I remember. Hell, try it and see what happens that way. I would set it up and then make a test strip noting where the timer is at each strip and then set the timer for the strip I liked and see what happens. If that works to your satisfaction then to figure the dry down I would make a strip at 5% less 7% less and 10% less and see which one looks the best. That will be the dry down time used only for the final prints. My problem is remembering to turn on that feature.