The Manson gauge is used (in its most efficient manner) horizontally, just like yours. Yes, as you refuse to realize, the vertical use of the Manson gauge is obsolete. I have explained the quite simple horizontal method many times on this forum. The Manson gauge does not come in a wooden box that costs more than your gauge. I have never seen such a box for a Manson gauge. The Manson gauge, no box, is $100 and will measure way more than nine inches. British proof doesn't mean nearly as much to us as wall thickness throughout the entire length of the tube. Your pictures on page three are a representation of exactly how the Manson gauge is used in the horizontal position. Oddly, you have saved me from having to post pictures. Yours work just fine.
