5mon
The Family Handyman on MSNCombination Square Hack: This Is the Secret to Perfectly Straight Lines for Your Next DIYTo help steady the pencil, this hack helps by creating a small notch at the end of the ruler in the combo square. Then, the ...
A PCB ruler is a common promotional item, or design exercise. Usually they have some sample outlines and holes as an aid to PCB design, but sometimes they also incorporate some circuitry.
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