I used my RH Designs Zonemaster II today in the lab, briefly. I guess it comes calibrated for Ilford Multigrade RC paper. I did a print in a jiffy today that looks great to me! I have tried it on fiber and it comes out too dark. I will have to figure out how to calibrate it for that. I'm still looking through the manual. I read it but forgot alot, so I am re-reading it. Any tips for first timers that I might not find in the manual?