Thanks!
I've got two LED displays in that box on the wall - the big one is an ATC 800+ which controlls the HLT (through an external relay to increase its power handling capabilities) and the small one is just a digital thermometer, which I use to check the temperatures in the MT. The small LCD display in the white circular doofa is an immersion heater timer, so that I can have it heating ready for when I get up in the morning.
The valentine arm is a way to automatically maintain the height of liquid in the MT whilst you fly sparge. Its sort of like an enclosed spout on the outlet from the MT; by rotating it you can set the height of the spout and so that determines how deep the water in the MT gets before it starts to spill over and empty any extra. There's a sort of breather tube at the top as well, to stop liquid syphoning through it. There was a thread describing them before so i didn't cover it in any detail myself, but I think thats now been deleted so I can't point you to it unfortunately.
I really like them; the only real disadvantage is that it stops you using the syphon effect unless you swap it for a normal tube before emptying the MT - though I took account of that in this setup as my MT drains from the bottom anyway. It can still overfill if you get a stuck mash as well, so you you can't entirely trust it, but since I went to perforated stainless false bottoms I almost never get that issue - in fact I suspect the arm may help prevent it by keeping a steady back pressure on the grain bed. Heres a closer picture:
Cheers
Kev