Long-nosed precision marker
In my workshop I use a Dixon needle-nosed marker for maximum accuracy. This is like a wire-thin sharpie that can reach deep into holes or tug close along edges to make a thin indelible line or dot. The handle is fat for your grip, but the business end is only 2mm wide and several inches long (like a hummingbird beak) making it perfect for precision marks on fabric, plastics, metals and wood. This Dixon is a slightly cheaper version of a similar Pica brand marker recommended by Adam Savage. — KK