Designed by a New Zealand carpenter, this unusual-looking Morgan Square is a measuring tool aimed at frame carpenters.
It has protrusions to hold a tape measure (both the body and the extended tape) in place, as well as a third protrusion perfectly sized to hold a carpenter's pencil. The tongue is precisely 1.5" thick, matching the width of a 2x4. Used all together, the tool makes marking stud positions on top and bottom plates faster.
How you use it is not at all obvious from the design, so here's a demonstration:
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