Jobo CPP 2 Processor question

On the Jobo CPP 2 Processor, what are the water level dial numbers "1" and "2" on the used for?

According to the Jobo instructions, those numbers are an aid to remembering which setting gave you the best results. Seems a bit of overkill but maybe the busy darkroom tech has too much to remember. From Jobo, "Rotate this dial to change the level of water in the upper trough. The numbers on the dial may be used for reference on later resets of the dial."

Paul "who just got his CPP-2 last week" Bujak