I actually had 3 EG&G Sensitometers as gifts from friends over the last few years. Two from one friend, and one from Grant Haist. They are all doing well. Thank you.
There are 3 different versions of the EG&G units out there. One has 3 selectable times, one has 4, and one has 4 and a curved object platen to account for edge falloff. The AEC (I think) found that the flat platen was not accurate enough and so EG&G designed one with a curved platen with constant distance from the light source.