How do you find the center of a doorway without doing the math?

Finish Carpentry
Doors
Layout

Halving an odd fraction in your head is where a centred fixture stops being centred, and on a doorway the error is visible from across the room. Show Center on the T1 Tomahawk tracks the midpoint live as you measure, so the number on the display is already the centre line. You mark it and check it against the blade instead of doing arithmetic on a jamb.

How the midpoint is found

Show Center tracks the midpoint live
T1 displays the centre, not the span
No halving an odd fraction in your head
Mark it and check against the blade
A doorway error shows across the room

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Let the tape do the division. Measure the opening with the T1 Tomahawk, switch on Show Center, and the display tracks the midpoint of that measurement in real time. In this doorway it reads 16 and 5/16 inches. Mark it, check it against the blade, and you have a center line without halving a fraction in your head.