Anybody ever use one of these things to find a filter pack and time? I got one off Ebay and just now got through trying it, and would you believe it? It nailed it! Granted I used a reflection densitometer instead of the grey cards to find the neutral spot on the grid and didn't follow its instructions about adding all three colors if the grid says to- in this I added the suggested filters, measured with my enlarging meter, took out the excess filtration and stopped it down to the require levels and made a print. I was really excited to see a perfect print with one try. Wow. I'm headed back down to the Dungeon to play some more. Igor-get the electrodes!