From Season 1, Episode 8 "Flesh and Bone", this is Baltar's Cylon Detector and printer (and also several slides of blood samples that appear to be real sample slides with the stickers replaced to say 'Human Blood Smear Cylon Screen' and a number. I have 100 slides (I think, one box of them), and each one has a different number! The detector itself is a hard drive case with a custom-made aluminum drawer. When you turn it on, the Power, 'Drive' and 'Ready' LEDs lights up. When you press the eject button, the drawer slides out. You can place a slide on it, and retract the drawer, and then the 'Ready' light goes off and the 'Scan' and 'Data' lights start to flicker back and forth, sort of like you'd expect drive lights to flicker as data is being read. There's a lot of attention to detail on this prop! The printer is an HP printer painted in the colors of BSG. It has an external control attached that just turns the paper-feed motor, and pre-printed 'results' are fed through the printer to give the appearance of it printing actual results.Here's a shot of Baltar loading a slide into the scanner, a close-up of one of the slides, and another shot of Baltar where you can see the printer and the scanner in the background.
