Re: adjustable square for SHS / box sections

"Richard Smith"  wrote in message news:m1wmdxuep7.fsf@void.com...
The "angle-aluminum" with its "drop-down" from the "top" surface marks
down from that top surface.  This is a longitudinal mark.  It will
always "match-up" (?).
I am painfully aware that these best-meant descriptions, where you'd
want a sketch, can be impenetrable.
Best wishes,
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I can visualize a solution that fits the description. I post here for practice describing with only words.