and finally, that voltage probe identified by lonepigeon is just hanging in front of Vader when he steps into the rebel base in ESB
Need to look closely to see it, but yes its thereI don't think this is the damsette mesh on the wall here as it doesn't have the weird deformed lines. Those are pretty close together on the radio so they couldn't have cut such a large piece without having the lines showing.
Edit: but you only meant the small circular mesh part in the center right? Sorry, that I agree with