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[Star Wars] What did Lando do the Carbonite?

In Episode V, as C-3PO is saying that Han should be OK if he survived the freezing process, Lando turns a small dial on the side of the carbonite's frame in a manner that suggests only the audience and himself know he's doing something to it. What's he doing?
gpt
I believe he's checking Han's life signs. Since immediately after that he says "He's fine. He's in hibernation" (or something like that). Maybe the dial was just there to adjust what vital signs he was looking at?