Measuring a door opening by butting the tool into the jamb

Doors
Layout
One-Handed Use

A door opening is two parallel faces with nothing to hook, so the usual answer is a bent blade or a helper at the far jamb. The T1R Range measures from the back of the tool, which means you butt the body into one jamb and read the other off the display in your hand. Widths and heights come off in the same pass and land in a saved list, so a corridor of openings gets recorded without a pencil coming out.

How the opening gets read

Butt the T1R body into the jamb, no hook
Measure from the back of the T1R
70 and 7/16 read off the hand, not the far end
No bent blade and no helper
Whole corridor of openings in one list

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Openings in a commercial corridor are measured, hollow metal frames with hinges and strike plates already set and no doors hung. The tool is butted against one jamb and the reading taken from the back of the body at seventy and seven-sixteenths, then repeated for the height. The display steps through several openings, from the low teens up past forty inches.