I picked up a Nuclear Associates Victoreen Digital Densitometer II off Ebay for not too much, but at this point I can go no further. It turns on, and the number on the display increases when a denser portion of negative passes under the probe thingy but now I have no idea how to proceed. I'm going to re-read The Negative, but have a few questions until I get my hands on a copy. Does anyone know where I can find a manual for it, ideally in PDF form? How to I calibrate the darn thing? Thanks for the help with this! - Justin Edit: OK, I've found the manual so now I've got some bedtime reading.