How do you mark a measurement when a pencil will not show?

Layout
Rough-In

On rough sheathing, treated timber or anything dusty, a pencil mark is gone by the time you come back to cut it. The T1 Tomahawk's green laser sets the position and a rotary tool scores it permanently, so the line survives handling, weather and a week of traffic. The layout is still there when the trade that needs it turns up.

When graphite will not survive

Pencil disappears on rough or treated stock
T1 laser sets the position
A rotary tool scores it permanently
Survives dust, weather and handling
Still there when the next trade arrives

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Cut the mark instead of drawing it. On a surface where graphite disappears, the green laser line gives you the position and a rotary tool scores it permanently. The line stays visible through dust and handling, which a pencil mark on rough sheathing generally does not.