The ND is the single output unit with night time temperature drop feature (as already stated by Serpents_Den).
However, the Pro has this night drop temperature feature on all four of it's outputs (so it's like owning four single ND units in one package), but I'm not sure if the II does this or not.
I purchased a Pro, knowing that the other outputs would eventually get used. I am very glad I did, as I am now planning my cage stack and it's future inhabitants. I might even need another unit.......come to think of it, they come in a new blue LCD color, and I might need to get two of them so they match......then the one I have now can go into running the Q-Room
.......and then.......
Maybe I do have an addiction
![]()