How do you take an overhead dimension without a helper?

Layout
One-Handed Use

Overhead is where a tape stops being a tool: nothing to hook, nobody to hold the far end, and a sag you cannot see from the floor. The T1R Range takes the shot by laser and then goes back to blade for the close work, with both readings landing in the same list. One person covers the whole set without a second pair of hands.

Where a blade stops working

Nothing to hook and nobody to hold it
Laser takes the shot you cannot reach
Blade handles the close work after
Both readings land in one list
One person, no ladder for the high one

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Switch to the laser for the shot you cannot reach. Overhead dimensions are where a tape runs out of usefulness, because there is nothing to hook and nobody to hold the far end. Take it with the laser, then switch back to the blade for the close work, with both readings landing in the same list.