I have this Honeywell control for indirect my HWH. I want to raise the temp but I can't read where I line up the numbers to. This is partly poor lighting, partly old eyes and partly poor access. It's tucked away a bit behind the boiler and can't see the other side.

Can I loosen that screw in the back and slide it out to see better?

Does anyone have any diagrams or better pictures so I can understand what I am looking at.

I already talked to my installer and this is his suggestion. Trying to save him a trip out if possible.