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@Buffalo_Bill
Steel ruler will work too, although it can be tricky to measure tubes. Inside to inside is generally the measurement to take for drop-outs and tubes.
I have no idea where the 27.2 standard comes from - prob some sort of imperial measurement. All my frames are currently 27.2, it's pretty common now, I think. The only frame I have which is not is my Gitane - I think it's 26.something or even 27.0. I seem to remember that Columbus tubing used to be 27.0, but I could just be making that up. That's the sort of thing that only a real tyre-kicker like dogsballs would have a definitive answer.
H/bar stem. If it's a quill (which means that it inserts into the the head-tube - where the h/set is), then it is standard 1" width. I can't recall ever seeing anything else in a quill stem.