Why counting lines on a tape blade slows you down

Layout
Accuracy
Site Prep

Reading a blade is three operations stacked: find the mark, count graduations, convert to a fraction. Each one can put you a sixteenth out, and all three get harder on a dusty slab where the marks are already faint. The T1 Tomahawk returns the number directly, which removes the step rather than asking you to do it more carefully.

Where line counting costs you

Find the mark, count lines, convert
Three chances to be a sixteenth out
T1 returns the number directly
Harder on faint or dusty layout marks
Removes the step, not just the effort

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Reading a tape means finding the mark, then counting graduations from it, then converting that to a fraction in your head. Every one of those steps is a chance to land a sixteenth out. A digital readout skips all three and gives you the number, which matters most when you are laying out on a slab and the marks are already faint.